I am 25 year old but What do you think I've never had a relationship?

I will be 25 years old in the winter but I've never had a partner so far.
I tried to use some dating apps sometimes for 3 years but it didn't work out for me to find someone. I felt like it is a vicious cycle so I deleted those apps last month.
I've dated with some guys but it didn't end up to being an official relationship. I experienced to sleep with some guys when I was young, so I am not a Virgin.
Some people approached me but I wasn't interested in them..
I guess I have a bad habit I refuse to reply to someone's feeling when someone likes me.
It makes me difficult to find a partner at the moment because of covid-19, and I plan to study abroad in other country next year.. I feel frustrated with this situation that i can't find someone..
I really want to find a perfect partner for me in real time, and settle down together in the future.
Do you have any pointers for me?
I am 25 year old but What do you think I've never had a relationship?
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