Im the middle child, was overweight with glasses, and had very few friends as well. Even my older cousin and younger brother ganged up on me. Guess they could tell I was "weak" and would just take it.
As far as your so called friends that didnt show, they arent worth your time. As soon as you learn to stop caring what other people think about you the better. I wasted a lot of time in high school trying to fit in. I wasnt truely happy until i decided to be myself. I convinced my parents to let me get contacts, went to the gym every day that summer, and transformed myself into the person I wanted to be. Just use your anger as motivation to make a positive change in yourself. You may never be able to look in the mirror and like the person you see, but the closer you can get the better.
I'm not telling you to become a rebel, but your parents need to realize that you are you and they need to accept how you are feeling. i kept everything from my parents like you. i didnt even tell them right away when i got admitted to the mental health unit for bi-polar disorder. they couldnt beleive the things i told them and asked me why i never shared. Your parents might be far more supportive than you think. After all, you are their child and love you unconditionally. Let someone know ASAP
Good luck friend