Hi. Im 15 and I recently had sexual intercourse with my boyfriend but he didn't fully get inside of me due to the fact that I was a virgin and I just couldn't take the pain. Im not sure if this has anything to do with it but I've been experiencing nausea when standing up (never vomited ), dizziness when standing up, stomach pain, back and neck pain, and I have to poop often when I stand as well... what could this possibly mean?