Do I have a disorder?

Hi! I'm new here. and not sure whether what I have is disorder. But it is often making my life difficult for me.
My problem is that i can't talk with people i don't know well? It just like.. i would really like to but when i'm supposed to talk my mind just empties..and i'm like dumb? Can't get word out of me. Just looking at people i should talk to and feel eneasy.
With people i know for years i am talkative and i have no problems in talking. But that is like my sisters and 3 really close friends.
People i know a bit i'm able to say few words to.. But that's all. I never end up in.. having conversation with them. I often feel miserable, depressed. I wish to talk to people, to be like everyone else.
I'm going to college next year. Feeling anxiety just thinking about it. I am so scared of ending up as total loner and weird person that no one cares about.
I don't really think it's real disorder.. But.. is there any help?? I'm grateful for every idea..

Hi, Noemi! You could take a look through the AvPD forum, even though we can't give you a diagnosis here and you'd probably only have some traits and not an actual disorder. Being shy and nervous around people, not knowing how to act or what to say, can go hand in hand with depression. You are not dumb and it's not your fault that this is happening. You should look for a therapist, though.
Were you bullied or abused by anyone?

It sounds to me like you have a bit of social anxiety, but I'm not a doctor. I would recommend looking into it though. I have these same thoughts to extremes and always had a difficult time making/keeping friends because I am too scared they will think I'm overzealous or something. It's hard to describe, but I was diagnosed with GAD because I also suffer from other anxieties as well. However, your thoughts and the way you describe your anxieties sounds like Social Anxiety Disorder. I would consult a physician.