Blowjob help

So... I'm very insecure about giving my first blowjob. Me and my SO have been sleeping together for about 2 months and done everything else.. I just can't bring myself to go down on him.. Is this weird? I just have no idea where to even start and feel so insecure about the fact that I don't know what I'm doing. He noticed it too as he has asked before why I never go down on him. He's the best and I care so much for him so I don't get why I feel this way?!