Going down on him?

A blowjob, handjob, etc. How do you get rid of the intial fear and disgust? Especially, if you're virgin. I'm 19 and I plan to stay virgin until marriage (my choice). But having fun with my boyfriend of 4 months isn't out of the question. I was raised by two moderately strict parents who didn't talk much about sex in detail or explain it to me. I want to please him very badly but I have him a handjob once and I could hardly look at it because of my fear. How do I get over it? I've watched porn (No judging please) and I know what it looks like but I can't get over my fear of looking at a real one.