Feeling weird without having someone to do things with

I broke up with my bf for reasons that I know needed to happen, and I'm honestly satisfied with the decision I made. However I'm struggling with having lost that person that I could do anything with. It feels strange to ask friends to do random tasks with now, since I would always do them with him, but it feels even worse doing it alone. Simple things like seeing a new film at the cinema or running errands - I have no idea who to ask now, because although I have friends, I don't have a "best friend" per say, and I'd always just do it with him. Its making me weirdly regretful of ending things just because I dont like feeling lonely. Anyone else struggle with this or know how to get used to just asking others to hangout?