Sex Problems

So my boyfriend and I recently started having sex and he spent a lot of time before he met me (5th grade to grade 12) masturbating and watching porn. When we have sex, he can't come inside me and he can't keep it up.
Also, the condoms we use (Trojan Ultra Thin w/Spermicidal Lube) move around his member. The come didn't stay in the recess at the tip, it kinda moves around in the condom. I'm afraid it will come out and I'll get pregnant. I can't take BC because my mom won't allow it and she won't cover it on our insurance.