I am a virgin but my boyfriend ejaculated directly on my vag and we have been trying sex (can't get it in). I missed period could I be pregnant?

You betcha! You could get pregnant by sitting on semen on a car seat. If you have had semen directly onto your vulva, that's like holding a lit match very close to a candle -- eventually it may light. My bigger concern is why you cannot tolerate vaginal penetration. Read about vaginismus, masturbate using sex toys, use plenty of lube and foreplay, (practice safe sex!), and try out the equipment!