This is where it takes work. You have to accept the fact every day this is your partner, you have to wrestle with thoughts of perhaps coming across an actual ideal partner some day. You have to learn to love your partner, and do things to make them happy, not necessarily things you want to do.
Because the alternative is to just be single and die alone surrounded by no one, childless in some nursing home where nurses increasingly don’t give a fuck about you the closer you are to death.
Some people will argue being single isn’t so bad. But for a person whose goal it is to be married and share life with someone it can be a fate worse than death. And the longer it takes to get married the more of your life you are living without sharing experiences with anyone that matters to you.