How to communicate with a guy?

I’m really not good with communication at all. I feel like I don’t know how to be a girlfriend. This has become a serious problem in my relationship. My bf feels like he’s not wanted & that I don’t care. But, that’s completely untrue. Sometimes I’m caught up with day to day stuff that I’ll forget to call or text him even though I do think about him. Other times i just don’t know how to make conversation. Is there any advice you guys can give me to help me out? Like what to say to make conversation even if I’m just calling to check in on him & how do I make him feel more wanted?