Yes, I have. I've never really been into a lot of the feminine coded things, even at a young age. My parents tried to force femininity on me and I just have never really felt it. I had questioned for a time, too, before getting dysphoria about my body & gender, about men's clothes (suits, specifically) because I personally felt like I wanted to wear those kinds of clothes.
I guess, then in my last year of high school, I had a lot of dysphoria that lasted a few years, so I kept trying to explore some of the gender identities outside the binary, until I discovered the identity "Trans Masculine" and felt like that one really fit me. Since then, I haven't really questioned my gender since since I found something I felt comfortable with. I do still get dysphoric about my body sometimes but I'm a lot happier now than I was before. I do still want a suit, btw, but they're so damn expensive, so I've settled for now, for hoodies and stuff that makes me look androgynous.
Also, before all this, when I was a kid, I did explore male identities online. But I don't know if that counts since I just set my gender as male on a profile and went by a male name (ie, Steven). And not in the rp kind of way, but back then when I was younger, I felt like it was something I needed to do.