Anxiety/Paranoia issues, is this normal or weird?

Sorry if this is going to be a bit long, but I'll try to make it as short as I can.

So I think I might have some kind of problem, I'm not sure because everything I do and feel seems perfectly natural to me. About a year or two ago I was always paranoid about things like if my food was poisoned (literally every meal I had I was suspicious of, i had to wait for someone else to eat before me) and I thought my family and friends actually hated me and my family wanted to kill me (I don't know why, I just did.) so I became depressed for a while. I didn't show this though, if anyone asked if there was anything wrong I would just say that I was tired or something. Back then I became so depressed that I cut myself once but then I was talking to my mum (I was trying to act normal, and for me that includes often having conversations with my family) and we somehow got onto the topic of depression and stuff, and she said that if one of her children ever cut themselves she might think about disowning them. So I became even more scared and have never cut since, and for a while I was better and wasn't paranoid about being killed or people hating me or anything, and I was happy for a while.

But now I think it's staring again - it's not very similar but there are some things that are the same. I don't think that my family wants to kill me anymore, and I will never, ever, ever cut again even if I wanted to. But I now do things like close my curtains all the time because I often get paranoid that the people living across from my bedroom are filming me inside my room through the window (for what reason, I don't know, but I don't like it) and there are people that I often see on the bus to school that look at me as if they know me and are pissed off with me, even though I've never even talked to them before. Also whenever I see some kind of small thing in my food that doesn't look right to me, I immediately think 'is it poisoned?', and I hardly eat anything at school because of this (we aren't allowed packed lunches in our school). I constantly get pissed off at or scared of my friends (I don't show it though, I try my best to act as normal as possible) because of a comment they have made to me (eg the other day I said to one friend some thing and she told me that we had had this conversation a few weeks ago and now I'm too scared to talk to her now because she thinks I'm boring and repetitive now) and because of this sort of thing I haven't been talking much in conversations becasue I'm scared that I'll say something and others will use it against me or misunderstand. Also I keep getting the vibe from some of my friends that they are always lying to me and stuff.

When I was like 7 years old I had this thing where I would constantly pick and scratch at my eyebrows and eyelashes, and after just a few weeks I had nothing left there, and my mum took me to the doctors but I never told that I had been picking at them, so all the doctor said was that I should wait for them to grow back. I would keep picking at them for months so I had nothing there for like 3 months or so, that was about the same time when my friends in primary school (most of which were older than me) were leaving school and I didn't trust the other friends who were in the same year as me because they were always with eachther and thought I was wierd, so I was nervous and angry all the time. About two years ago, the same time when I thought my family were trying to kill me, I was picking at the hair on my head so I had several small bald patches on my head (I could cover them up with the other hair on my head so not many people noticed luckily) and my mum took me to the GP again but I didn't say that I was doing it because I didn't want my mum to know, or anyone for that matter, so they just said to wait for the hair to grow back again. Also a year ago, so when I was in year 9, I was ill for literally 50% of the school year. Some times I would fake it because I didn't want to face being around people at school for one reason or another, and sometimes I actually did feel ill. So I spent the majority of year 9 locked up in my room (literally. I have a lock on my door.). My mum took me to the GP several times and they perscribed me medicine and I took it sometimes but sometimes I would fake taking it because I didn't want to have any side effects or anything, and when I did take it it didn't make any difference anyway. If I wasn't ill and I was at school, I would often skip lessons which I got in trouble for a few times, and several adults asked why I did, but I just told them that I hated the subject or something, which wasn't true because I don't mind the learning part of school. Now in year 10 (so I'm 14 years old now)I don't skip school but I am picking at the hairs on my arms quite a bit, not as much as I did for my eyebrows or the hair on my head, but I'm still doing it. I don't want my arms to get all mangles or anything, so I'm trying to bite my nails and fiddle with things like my hair and necklaces and stuff instead. Also I went to the dentists for a check up the other day and she told me that I have been clenching my teeth too much because my jaw muscles are stiff and my canine teeth aren't as pointy as they should be, and she told my mum that maybe I'm having some stress problems or something, but I denied this.

Yeah I could say more but I think this is getting too long now and I don't want to bore you too much, but would you say that I have a problem with Paranoia or Anxiety or something, and do you think I should do anything about this? I'm really confused because I never want to trust anyone but all my friends seem to trust me for some reason, but I don't trust any of them at all.

Hi, RL123456! It does sound like you have issues with anxiety and some fears. Have you thought about at least confiding in the school counselor?
Pulling your hear out sounds a bit like this trichotillomania/ I can't diagnose you, I'm not a professional psych nor is anyone else on this site, but you could check that forum out as well as the "what helps you not pull" sticky.