If he's like this now, I cannot imagine what he's going to be like in 20 years. It just sounds to me like you don't have enough in common, and that he doesn't really enjoy spending time with you. To enjoy spending time with someone, you have to feel like the time you spend with them is better or at least equal to the time you spend alone or elsewhere.
These things that you want aren't getting to the crux to the matter (like him suggesting time at the beach). Some men might suggest lots of things they want to do with you, but you might still feel like your only role is to be a 'someone' with them. That is, they just don't want to go alone so you, being their partner, are invited because you are the person that would make the most sense to invite. You might find someone very active indeed.....but then you find out that you're in exactly the same situation as before - that they either prioritise their own activities every time over what you'd like to do, or that everything just seems surface level without any depth.
What you want is deeper that. You need to feel connection, intimacy and wanted. You want to feel like he wants to spending time with you, and that he's not doing it as a chore, and that you're not being used to fill a slot.
I think you're right - everything does seem to revolve around his wants. It's not just the going out thing either. If things were lovely in the house, I don't think you would mind quite as much that he wasn't keen on going places and he was more of a homebody.....but it's bigger than that. At the moment, you don't really feel like you have a great partner inside nor outside the house. No wonder you're unhappy.