What's up with my food issues?

I find that I'm highly conscious of what I eat and I'm always comparing how I look with other girls. I hate clothes shopping because I've never been happy with the way I look. I hate eating in front of other people because I don't like others watching me eat (although I don't know why this is). If I sometimes eat more than normal I find myself desperately unhappy for a long time afterwards. My mum thinks I'm dieting / have an eating disorder, although it's her fault I'm obsessed with my body image because she always used to tease me about my shape since I was about 12 (except it was never funny). As a result other members of my family used to do the same which made it a lot worse. By the way I'm 16 years old, 5'1 and weigh 103 pounds. I'd really appreciate any sort of advice generally. thanks.

honestly, you're normal for your height, age, etc.

lol im 5'1 too...except im 13 and weigh more than u...lol you are totally healthy. its ok to hate clothes shopping because you probaly hate it when you find clothes you love but dont have your size.Honestly dont let them tell you your fat. you are the only one who can judge yourself. Just keep for confidence high and boys will love u, For being u

lol, I used to tease my little sister about her pudgy belly. I used to say she looked preggo but I was just teasing her and so are your parents and siblings. Dont take it personal. Most teenage girls are the same way as far as comparing yourself to other girls. You most likely wont ever grow out of that, when I see a girl I think is prettier or dressed better than me I just tell myself next time I go shopping I'll make myself look better than her. Lol.

your BMI is 19.5, so you're at the low end of healthy.
you do seem to have some eating problems.
I'm here to chat if you need me.