I am having trouble getting off while receiving head.
Do you think there is a reason specifically why you can't get off?
That's just the way it is, I'm not in the mood to make this relationship work if it can't satisfy me in such a simple thing.
Something's amiss if you're not connecting in bed and you don't feel like making tying to make the relationship work.  It might help if the two of you could take time out for some date nights to reconnect.
What did you just say? Are you blaming for the boring sex?
I'm just saying that you shouldn't give up on your relationship when you're having troubles in the bedroom. You might just be a little stressed and talking about it with your partner could be very helpful. Once this stress is gone, then maybe you can focus more when having sex.