25 is so young. For me, I just had casual relationships until something “stuck”, for lack of a better word. Stayed with my ex for 25 years, with my husband now for 11, we are so happy together and the sex is still good. Husband said he knew at the start he would be serious about me, I didn’t know until it lasted and got better and I liked his family, and his kids liked me and all our kids got along (more complicated situation when older, obviously) AND the sex stayed good and we still felt affectionate and loving.

I would say, at your age, it’s entirely possible you just haven’t met someone yet who you can feel that way about. You do have to be open to it if you want it, if that makes sense.

And I need to add- it’s not a requirement for a full and happy life, if you don’t want to pair up you don’t have to.