How can I overcome this crush?

Sounds more like infatuation than love.

Give her a good rogering and then let us know.

He doesn’t want to be in a relationship. What better reason could there be?

The word to Google is limerence.

There are resources available online. Good luck, a heavy crush when you don’t want to feel that way is no fun.

Marry her is indeed the solution if your crush means being fond of someone and developing feelings of affection for her. Yes, marry that person, but not because you won’t love her anymore but because you could learn how to manage your love needs and build strategies to fulfill them.

But if it’s just a crush based on teen-like erotic lust, it will be easy to replace her with someone more interesting or better looking.

Putting this person on a pedestal isnt going to help you approach, is going to lead to disappointment when you date. All people have major defects which are hidden, yours are just in front of your face, which gives you the illusion of not being good enough.
Trust me, there will be something wrong with her, there are no awesome human beings out there.
The sooner you really really belive that the sooner you will find someone with defects that dont bother you, because you will be really looking at the real person in their totality, instead of trying to force them to conform to the perfect image of hem you have created, which they will rightfully not live up to, given that they never promised to meet your high expectation-fantasy of them.
listen to grandpa, he’ll tell you just this