If you feel it's a part of you, then I don't think you have a choice. sure it can be repressed, but look at how many have it come back later in life and how much it tortures them. Although I think the biggest thing is whether you're TG or just a CD.
I don't think it's fair to start a relationship as a TG without the girl knowing, just imagine if she did that to you. You''d be (reasonably) angry if you found out she was hiding that from you all along.
But if you aren't TG and just enjoy dressing up, there's nothing stopping you from having a nice girl and dressing up on the side. Plus she may even be into it =)