How to accept the fact that i’m going to be alone forever and be single?

so no one wants to be with me because suppoably i rush things like me wanting marriage and kids right now . im 23 and i know i’m young but i want a family already . So my ex left me because i wanted kids and marriage and he didn’t ., idk what’s wrong with having those two things . So i guess i’ll just be single forever and have kids from doners... since nobody wants me and is so against marriage and kids