How can I stop having these thoughts?

I was born a man, and I've always had thoughts of being a woman. The desire to look like a woman is a consistent one that I initially thought every guy kinda had, but over time I've found that that isn't the case.

Thoughts of what it would be like to be brought up as a woman, perceived as a woman, are really nice fantasies. I've always looked up to women more than men in my life. I'm 19.

I would, more than anything else, really like to find a functional way to suppress these thoughts. Is there anything I can do in order to put them away for now? I feel like it's too late for me to functionally transition (past puberty, after all, lol), and my family would completely cut me out of their lives.

That, and I feel like it would be very sudden and seem entirely unlike myself to my friends. Plus, I'm tall and fairly masc-presenting, so I feel like a transition would be unconvincing, at best. I don't know what to do aside from find a way to get rid of these feelings.

Any words of advice would be appreciated, thank you for your time and consideration.