I can't stop eating unhealthy, no matter how hard I try, any tips?

I’m not comfortable with the way I look at all. Guys flirt with my bestfriend infront of me all the time and it kills me. I try so hard to be pretty and people tell me im pretty all the time but im sick of hearing that. Fat is not pretty and no guys like fat girls. I’ve been dieting and i even did weight watchers and lost 13 pounds but i stopped going and started the carb diet where i lost another 10 but now i keep cheating every other day. And i feel bad for doing it after but i dont think when i go for the batch of brownies ( that i might add my mom makes every other night—the nights i cheat)and when i eat them i just say “i already cheated, mine as well keep going” so now im stuck at 156 and im not gonna be able to wear a bakini this summer like all my friends.