Hop in the boat, there's room for more.
By your photo I'm going to say you are a bit (being nice) younger than I. At my early stages of full dressing many years ago I was always gung ho. Any chance for any length of time and deluded myself that I was beautiful and sexy. Of course the mirror lies, we all know that. But that was good enough for me at that time. As I aged and dressed more for myself and less for whatever there were many times when I'd wonder why, how long will this last, will I always love being this way. Well, the answer is NO. I don't always love me this way, but I do Like me this way and I accept this is part of the whole.
Certainly there are days I put on my wig, apply my makeup and say "Damn girl, you are fabulous" but there are many more when I'm just like any woman and see nothing but my flaws. I'm too tall, I'm too heavy, I'm too old, I don't have any hips or butt and hate wearing all that padding, I hate this wig and it itches, Oh those darn wrinkles, why do my nails always break just when they are getting pretty.
Everyone is critical of their appearance whether they admit it or not. It's just the way we are.
As for being 6'5". Can you find clothes to fit? Sure you can because there are lots of women who are that tall and taller. Dress for you and be confident in who you are. I used to work with a gal that was 6'3". She always wore 4" heels and mini skirts. She towered over everyone, she knew it and she loved it. People will stare if you are anything but Average in every way. Ignore them, or better yet, stare back. That makes them worry if something is different about them.