Need to lose weight!!!! Help Me!!!?

Ok here is the deal last year i was in softball and basketball i lost a lot of weight. Then i had to run bleachers a lot in athletics.Also over the summer i got to swim a lot. Well first i was at 155 then 153 now 146. But i think i gained weight i need some help on how to eat healthy and lose a lot os weight. So please help me!!!!!!!