I think I've had this problem before. It sort of feels like "where do I even begin? Do I actually tell them about myself or do I just write some superficial things that don't really mean anything?"

One thing that I tried to do was think about things I like; music, sports, politics, tv shows etc. I also tried to not make too big a deal out of it which it seems like it might be a little late for that for you haha but its ok, like most things you'll do it and move on and probably forget about it soon enough.

I never really feel like I have any accomplishments and I am far too modest to ever draw attention to anything I might have done worthy of praise.

In interviews I simply try to apply past experiences to whatever job I'm applying for so people think I have some skills that might come in handy.