Even though you are young, you do need to find a balance which works for you. I feels this is true regardless of whatever age you are.

With that said, you may want to sit down and put together a roadmap of milestones you need to achieve in order to reach whatever goals you have. Then you could figure out what steps you need to take in order to reach those milestones. By doing this, you can see what has to be done and when which give you a good idea of how much time you will have to devote to that aspect of your life, leaving you with (hopefully) time left over to actually go out and enjoy other things in your life.

Just my two cents. Hope it helped!

Wesley Craig Green