Hey there,
As to the what do you think, it is really hard to tell from your post, but I will try to explain it from what my experience has been. At eight years old I knew something wasn't right, as I liked doing girl stuff even at that age. Puberty was a nightmare and then I spent many years trying to bottle up the obvious.
One thing I would say is there is a big difference between sexual pleasure and gender dysphora... As to the sex, my theory is if it works for you do it. Including dressing up... Myself I am bi-sexual and tend to lean to the male attraction. That said, I have been in a wonderful relationship with a great lady for twenty plus years and we are very active sexually.
I think the thing to remember here is being transgender and fulfilling a sexual fantasy are completely different from each other. If you feel you are female then seek therapy and follow the path to transition. If not, continue fulfilling your sexual desires... Pretty simple actually, but do keep the two separate as there is a big difference.
Hugs
Veronica