It is hard. Is there a lot of junk food in your home? if there is could you talk to your parents about it. Good healthy eating is good for the whole family, and something you can work on together. Don't be too hard on yourself, cause it is hard. And changes and habits happen slowly, just keep putting the effort in. it takes time to figure out healthier eating pattens, and impliment them.

Being active and outdoors is important for everyone too. Can you try to schedual a little time in for that. You are young, and need to have fun outdoors, so it should be a priority to get some of that in. I know it's hard because life has so many demands, but important to not let lifes demands take over and not allow us time to just live.