You're getting a lot of "You do you, bestie!" in the responses and I'd like to gently push back on that. As someone who shared with them the false liberal thought that "there's no ethics of cognition/feeling," I have since come to learn that there is and it can be kind of important for your mental health to recognize that, depending on what challenges you experience to begin with. Some cognitive patterns can have a negative impact on you inherently (negative self-talk is a classic example), some can more directly get in the way of doing positive things (read any testimonial about porn addiction), and some will make you more prone to harm others (pedophilia, for example). Counterproductive thought patterns can catch people by surprise at various points in their life, but they shouldn't shrug and say "You do you, bestie!" and then indulge in those patterns.

That said, I think you're fine, this sort of thing wears itself out in a matter of days normally and, if it hasn't, you should probably seek more serious advice. In the meantime, rather than beat yourself up for having a crush (beating yourself up is another negative pattern), it would be much better to simply try to redirect your thoughts to something else. If you are incapable of refocusing after you've had the moment of lucidity needed to realize you should refocus, then that's another sign that it's a more serious issue. That said, there is probably nothing serious about it.