I need some hope for this summer, can anyone Help?

I play Ice Hockey, and to keep everything short. I think I have no future. My grades sucks, I cant get into college out of HS, and Hockey is the hardest sport to get into professional. But I really wanted to lose weight this summer so I could start to really prepare for the season coming up in August. I weigh 193 and im 17 and 5"6 I think. Ive tried exercising for like 30 minutes a day and cutting back on my eating. I really need to drop some weight and get fit.I really am losing some hope here that I can't accomplish anything in my life I try to do.