Not feel ugly

Well I’m fuked when it comes to looks. I have bad frizzy greasy hair not matter what shampoo or conditioners I use, I have acne on my face + chest + all over my back, I have bad teeth and on top of that I’m fat as a whale. I hate It when girls say “it’s the stuff on the inside that matters”. Well if that was true I doubt majority of girls would be single. Guys want looks (so I guess I’m fuked!) and girls only say that to feel good about themselves. I’m 16, have no friends, no boyfriend (never had one and probably will be alone forever). The only clothes I wear are sweatpants and giant oversized shirts even on hot summer days because I’m that disgusted with myself. My mum says my acne and my weight gain is just a teen phase and that EVERYONE goes through it. Well I’ll be damned! All the girls at my school are skinny, pretty and had flawless skin. Where did I go wrong?....