Ok 1 year a go, a girl did oral on me... Get the point no condom

I've learnt my lesson, but Im really scared about having an STD

I seem not to show any symptoms other then a bleed bumhole ~ which I think is cause there is a cut 

Im 15 and scared, If I did have an STD is it still curable? Depending on which one

Please help am worrying alot :(