Nervous...

Tamsin • 16 going on 17
I'm 16 going on 17 in early April and my boyfriend and I haven't had sex yet (and I don't plan to for a while longer as we haven't been dating that long) but we do enjoy fooling around a bit - but the one problem is that he's the first boyfriend I've had and I'm still a virgin, and I'm just so nervous on giving him a blow job or hand job. He's said to me it's fine if I don't want to and is very understanding about me being nervous but I still feel so bad that I can't return the favour if he does anything to me. I know it probably sounds like a strange question but has anyone got any tips on how to sort of stop the nerves that I get?