<human>: I started going out with this girl a few weeks ago after my friends told me she was interested in me. I asked her out and she was really excited when I did it. 

I am and have never been the epitome of self-confidence, but I know she is too good for me. I'm kind of fat, average looking face, mild mental health problems, and not great with meeting new people, aka half the people on reddit. 

I cannot understand why she likes me so much. She has so many other friends who are better looking than me and probably better than me at talking and have had relationships before. (I should probably mention that she is my first girlfriend). 

I find myself being worried and so anxious when she hangs out with other guys when I'm not there. I get to the point where I'm almost crying due to it.

Am I being rational?

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: I am really worried that she's going to break up with me because of my lack of experience at life in general also in the area of romance.