<human>: Condense the text into a few key points

I've been with my boyfriend[26M] for about 4 years now. Everything has been going pretty well. There's not really anything wrong with our relationship, but lately I've been having negative thoughts about two things. 

First, I feel like my bf has very little ambition. He is content making just enough money to get by, and he doesn't seem to have passion for anything really. I don't care much about the money, but I just wish he was more driven or at least had a hobby he cared a lot about. I went into more detail about this in a post to a different subreddit if you feel like looking for it. 

Second, the thing I feel really guilty about. I basically haven't known what it's like to not be in a relationship. I haven't been single for more than 3 months since I was 16. Part of me wants to know what it's like, even though I know I love my bf. I want to know what it's like to not be committed to someone I guess. I feel like a complete bitch for feeling this way though because my bf is such a great person, and he cares deeply for me.

I guess I just don't know what to do. Obviously communicating all of this to him is best, but I know it's going to hurt him a lot. I would hate to make him feel awful.
<bot>: I think my bf isn't ambitious, and I also want to know what it's like to be single. I feel very guilty for having these thoughts, and I don't know how to handle it.