first time? and expectations.

Me and my boyfriend have been trying to stretch my vagina very slowly because I am really sensitive and very tight. ( I don't even wear tampons because it hurts to put them in) Today we actually made some progress and the head of his penis fit, it hurt at first, once he had the head in it was fine, but when he would try to slowly go in deeper I keep getting this pain, idk of its stretching or pinching kind of pain. It's hard to describe.. so we stopped. My vagina has been pretty soar for the rest of the day, and when I went to the restroom about a 1/2 hour later I wiped and there was a very light pink spots of blood. I just wanted to know if this is normal? And if we are just doing it wrong and that's why it stops and starts to hurt? I want to be safe about this. Thank you! Also any advice for full penetration or first time would be great! Also, were both virgins so we're kind of newbies at this sex thing. Lol