Could someone please give me poetry advice?

The fact that you're 16 is meaningless. There are poets here your age and less that out-write me. The fact that it's your first poem is significant. Poetry takes time to develop, and you have a promising start. For your next write, I would suggest avoiding cliches, and stay on point strictly. Here your point wears thin in spots, causing the poem to lose any strength you've gained. Not a bad first try overall, keep writing!