Is this a STD/STI

Ok so over a month ago I had unprotected sex. I don’t know if this is related but I noticed some bumps that looked like molluscum that were everywhere (pale or brown), extremely itchy everywhere. Now 4-5 weeks later I have been still itchy but my clit is very irritated and sensitive. Hurts when clothes rubs against it only and to touch. So just now I checked and there were like yellow discharge stuck to the pubes where my clit is and an ulcer. Also there’s a very very foul smell. Please help

Sounds likely but it could just be an infection (yeast,bv) which can also be caused by sex but the best way to figure out is in a clinic especially since you say theres an ulcer and a foul smell.. Dont have sex until it heals because it exposes you more to stis and vaginal infections..

It's hard to offer advice without a pic, but haven't you seen a doctor already?  You could either see your GP, or if you're in the UK, you could go to a genitourinary medicine (GUM) clinic - google "GUM clinic near me" for details.

If you could update this thread and tell us what the doctors say, it would be appreciated.  Good luck.