Hi Im Am a 21 year old Male!!

I have been feeling extreme pain or Burn sensation while I am Urinating!!!
I noticed that this happen right after I had sex with My Girlfriend!! I was thinking that I got hurt because We had been rubbing and bumping really hard while we still had clothes on!! the first time I felt this was when I urinated 1 hour after My Girlfriend and I Were done! I can see little blood when I finish urinating!!
The Pain is so Strong, that Im even scared of Urinating when I need!!

If anybody out there knows anything about this or has any comments.... Please Let Me Know!! Thank You!!