What are the actual chances of me getting an STD from having

If you use a condom it's really low afaik. At least not worth worrying over.
STD's like HIV are already very low chance to get (as long as it's piv and not anal) even without protection. But it's just that the very small risk of getting it isn't worth it. By using a condom you make that risk practically 0%.

>>17318806
She's a stripper though. Surely the chances are higher

>>17318794
I don't think you have anything to worry about. She's only a stripper. If she were an escort or prostitute, then your concerns would be justified.