Weight gaining and loss

I have gained 6 pounds over the summer. I know I’m wayyyy overweight. I’m 5’1 and 218. I’ve been trying to lose weight since the beinging of July. I’ve stopped drinking everything but water. I’ve been doing crunches as often as I can. Like every 2-3 days. I just tried on my school uniform and it’s a little tight. I have spanx under my uniform. Idk what to do anymore. I drank slim fast all school year last year. I stopped it this summer. I’ve been eating healthy. I need help. I hate my body. I’ve trued to love it and I just can’t. It’s my senior year. Everything was supposed to change.