I think I might be bad at blowjobs

Emily
Sooo the other day I was giving my boyfriend head, and I thought I was doing a good job, but then his friend was calling him on FaceTime and I said he could answer it if he wanted (assuming he would be like no way) and he answered it! I felt super stupid and after he was done talking to his friend he asked if I was mad- I said "no, but I guess you really weren't that into it" and all he said was sorry.. 
Like I don't use my teeth or anything and I know not too, am I not sucking hard enough? Am I not going deep enough? It seems that he gets off quicker when I just give him a handjob. Help I need tips/advise :(