i think that if you have a passion for this, you should go for it. i have only been playing the piano for two years. but i have composed melodies that have one me first place in compotitions. whatever your age, whatever your skill, whatever your instrument, if you have a passion for this, GO FOR IT! Listening to a variety of music will help. learn your theory. embrace music. learn from your mistakes. and as far as your short pieces of music go, keep them. they might just be the beginning of a great masterpiece. and just like writers, musicians go through times when we can't come up with something. but that is okay. sometimes just taking a break can help with that. and no matter what anyone tells you. You are writing for you, and only you. well i hope this has helped.