Who you marry is entirely your choice.
Nobody can force that upon you.
If you get potentials you don't want to have a marriage with, of course it is your right to reject that proposal.
If you reject every proposal as they come because you don't want to have a marriage with any of them, that's your personal preference.
That being said, I don't think you should make a broad generalization about yourself or think that everything's set in stone like that.
If you get proposals consider them honestly, maybe one of them might make you rethink about not marrying. Allahu alam.
And maybe when you consider them honestly, you'll happen to reject every one of them; which is perfectly fine. Allahu alam.
Choosing to marry any individual is a personal preference so whatever your reasons for rejecting a proposal, that is your personal preferences and should not be considered a sin.
https://islamqa.info/en/1665