Don't apologize. The way you're feeling is common, especially in trans community.
The bad news, the dysphoria doesn't go away, even if you do a heck of a job suppressing and hiding it. I thought I did. I genuinely thought the dysphoria was gone. But It only delayed it.
The good news? Accepting yourself for who and what you are is the most wonderful feeling. Nobody WANTS gender dysphoria. It just makes life harder. All I ever wanted was to feel "normal." And actually accepting myself made me feel more normal.
I am right there with you, even the same age. Getting Sir'd is like nails on the blackboard. I've been in therapy for 14 years trying to fix what's wrong with me without ever acknowledging my dysphoria. I finally did last year and I feel a weight has been lifted. Not there's not going to be a slew of new problems (how it affects my wife and daughter, $ for transition, the will I pass question), but I finally feel good about myself. I have a long way to go, but I'm looking forward to the trip.
Find yourself a good therapist, preferably one that understands gender issues, and look for a support group. You've got a great one here, but nothing personal contact.
Good luck and hugs. Remember, you are never alone.