Blow my boyfriend?

I am 15 in high school. I have been dating a guy for a while. We have made out and minor little things but we have been thinking about going up to the next step. I’m really insecure about my body and the only thing I currently am willing to do is blow him. I don’t know...

I’m really scared to. It’s not that I don’t want to. I just feel like it was be bad and awkward. He has told me he wouldn’t care. But we are both inexperienced.