Just always consider how difficult it is to carve out a career in music, ask yourself if your really up for it, and do you really have the ability and dedication required? It's not a walk in the park
Luckily your still very young so plenty of time to decide what your doing, but trust me youl hit 20 in no time and by then you better start to have a good plan, and good tools (qualifications) to carry out that plan
Just don't spend the next 4 years "working on a couple tunes" in your bedroom without either getting really serious about it or having something else productive on the side which could lead to a career
Coz if all your doing is music, then that's your only current route to a career, so if your gonna do it, do it propli, coz it's not gonna be easy at all to really make something out of it