What do I do now? I'm so stressed.?

It's almost a month since I started working out and such. I lost 2 kg only. I'm tired of counting calories and I hate it when people around me start choosing food for me, its like I CAN'T EAT ANYTHING AT ALL, except fruits and veg. I'm so sick of it. I eat much less than ever now but never skipped any meals. I'm taking this really seriously.. I swear. I'm fifteen and I'm a girl, weighing 134 pounds and I'm 5 feet 4 inches. I'm not fat, I'm slightly chubby. I want to lose weight because I want to look smaller, I have a large body frame and I wanna have smaller thighs too. I'm really active in sports (softball, basketball, badminton, handball, table tennis), I love sports a lot but sometimes I get tired of it, I feel like I'm obsessed with exercising or something. I feel guilty and often worried about the food I consume. So sometimes I end up doing guilty exercises to 'punish' myself even when I'm really really tired after coming back from school. Now I attend fitness cles twice a week (1 hour). It's kind of nice and I feel really good after exercising. My major exam is 3 months away, so I'm stressed right now. I need to get straight A's and wants lose weight at the same time. What do I do now? :(