Quitting Basketball For Snowboarding?

Hey guys I need some help. My parents made me play basketball and baseball since I was like 5, and now I'm 14. I started snowboarding and I love it. You get to do what you want when you want and you don't have to listen to coaches or anything. I love it! So I stopped playing baseball last year because I wasn't very good and because of the coaches. I don't like basketball AT ALL, but I LOVE snowboarding. My problem is that they are at the same time of the year. My parents won't let me quit basketball to snowboard. They say I won't get enough exersise but I'll go pretty much every other day. Oh and another problem is that all my friends quit to snowboard and ski so I don't even have any friends on the team. Please can someone help me?