Blowjob experiments

I want to kinda "experiment" with different types of angles,licks, and "methods" to see what my boyfriend likes. However, when I go down on my man he never lets me take control. I mean, it's sexy when he's dominating but when it comes to blowjobs, I lack in that department. I just want to give him a good time but I feel like he won't let me? Like I will try to go on my knees and he'll pull me up and have me lean over instead. I'll try to suck on his balls but he will pull me back to his cock. I understand if he doesn't like certain things but then again I'm a newbie so I don't know! Should I be more assertive and talk to him about it?