Hi, Marty! Here's my two cents' worth:
I'm 5'3" and I lived a lot of years in the male world. When I finally decided to come out, I got two for the price of one--right gender and right size. Lucky for me.
But I'm not going to BS you. It's not fun being a very small male. Some of the things I had to put up with were discouraging, to say the least.
One example: a guy I knew was basically a very decent guy at heart, just incredibly brainless in ways. One day he said something to me I simply could not believe. I didn't just count to ten. I counted to ten million. I gave myself a couple of days to cool down before I went back and confronted him. And even so, I was so mad I was having a hard time trying not to break down crying. But I got through to him. He realized he'd gone way too far. And he never said anything like that again. So, yes, you'll have that sort of stuff to contend with.
On the other hand, what you'll discover is that if you're someone who's worthy of respect, people who themselves are worthy of respect will respect you. They won't let your size bother them. It simply won't be a factor with them. You'll discover that life is very liveable. Everybody has something they have to put up with. It's no fun, but the world is full of ****holes, and it's not just people who are too tall or too small who have to put up with them.
So you see, I'm in a position to compare: which is worse, wrong gender or wrong size? And I can tell you, it's no contest. You want to be the right gender.