Well you can write. And I presume you read stories? A useful question to ask might be- how would you know if it was good or not? When you read it back how do you feel about it. The trouble with relying on other peoples judgement is that everyone is different, everyone has their own taste and everyone has their own opinion on what is good or not.

You've just started writing and you're in a vulnerable period where other peoples judgements could be helpful- or they could be damaging to your sense of self worth. I've only just seen this post and the song you're working on and that tells me enough to know that you're a naturally creative person. You need to express yourself. So do it. Don't worry too much about what other people think. Do it for yourself and over time you'll develop your own style, your own voice, your own sense of taste. You'll find your way and you'll attract the right people.