Medication help for a first-timer

I'm new to this forum, and mental health stuff in general, and would like some help!. I just started seeing a counselor at my school and attending group therapy for some anxiety/concentration problems. Today I went to a psychiatrist nurse practitioner who recommended I go on an SSRI antidepressant along with my therapy. Honestly, I was relieved she recommended this because it makes my "problems" somehow valid. Some of my symptoms: trouble forming deep relationships (and putting work into relationships), being open with others, anxiety in social situations and a lot of other settings (work, school, etc), being moody, trouble concentrating, comparing myself to others all the time...Overall just a lot of insecurity, worrying I'm not good enough or doing enough in life. However, sometimes I feel fine and other times I am anxious, it just depends. I've researched a lot about Lexapro, Prozac, etc, and I am just really worried that there is nothing chemically or medically actually wrong with me, and that this is just part of me somehow (I am aware that psychiatrists don't take that many precautions in writing these prescriptions). I've been reading about how this medication treats usually treats people with serious, clinical depression and am worried I would be just taking it to "take the easy way out" in life's hard situations and don't actually need it. My mother's opinion on the matter hasn't helped because she doesn't believe antidepressants are useful and thinks I am completely fine! Basically, I do want to feel better about my life but am worried (anxious of course!!) about starting on a medication. Some help please?

If your doctor has recommended you take those medications, then you should take them. I have suffered with social anxiety, I take meds and they have helped, I feel much better.
Sometimes they can make you feel worse for the first few weeks, then you start to feel better it might take six weeks to receive the full benefit.
I don't know if your relationship with your mother is good or not, but mother does not always know best. She is obviously not listening to you or she would be aware of how you feel.
Listen to your doctor.
Keep a diary, charting how you feel, start it now.