Too many. It's kind of embarrassing to admit this, but the main one has to do with body structure. Since I don't really look muscular or anything, I REFUSE to take off my shirt anywhere and at any time. If I take off my shirt, I will always shut the door. If I'm at some water part, I tend to wear a t-shirt or have a towel over my body the entire time until I have to jump in the pool. But if I'm in water, I try not to stand out. I also feel I might be a tad too fat.
I'm a little insecure about my height. While I may seem tall in my family (my Dad is still a little taller than me), I'm pretty short in reality (I'm 5'5").
Especially around people in real life, I get really quiet when it's about things I love (such as video games, politics, sports, and other topics I argue about online), unless I truly know someone is into that stuff too. I'm kind of insecure in reality about my video game collection. I hide it in my closet so those who visit me in real life, don't know my console preference ever (I've done this for many years). I especially do this around my best friend.
I'm kind of insecure about my hair. If my hair hasn't been cut in a week, I will try wearing a hat or go un-noticed. I definitely do not take pictures of when my hair is long. I feel when my hair is long, it looks terrible.
I'm a tad insecure about my voice, because if I don't know the people around me, I kind of feel they'll make fun of me for my strange voice. It's not as hard online since I don't know many of you in reality.
I'm a little insecure about my breath, which is why I hate talking in front of people. I sometimes think it's not minty enough or smells bad. I use to brush my teeth more than 5 times a day in college since I wanted it to be fine (along with my teeth being cleaned).