This was never an issue for me. I knew I was bi as early as high school, fucked a transfem in my early 20s, and now I am one. I recommend getting over your internalized homophobia, which I used to have. It can take effort to overcome psychological barriers, but it gets a lot easier after the first time. The only differences with a cis male are that his skin is slightly rougher, no breasts, and potentially a different personality. If you’re ok with those differences, you may as well fuck a guy.