My sister was a big tomboy, and was very into sports (all of them) and played them well. We used to joke she was the boy in the family. But she also liked to tap dance and twirl the baton, and even though she dressed in ratty clothes most of the time, and disliked dresses, she still liked to put her makeup on and get dolled up for an event.
Me, on the other hand, thought I was a tomboy. I was the one hanging out with the neighborhood boys, with the cows, catching frogs and toads, climbing trees, etc. I wasn't into sports and also hated dresses. I, too, preferred boys clothes and ratty clothes. But I loathed dresses and hated getting dressed up. Never used makeup, wearing it made my skin crawl. When i tried to look like a girl (my dad loved seeing his girls dressed up like little ladies!) I felt creeped out, fake, and couldn't wait for whatever event I was at to be over so i could change. As an adult, I would take a bag with my comfortable clothes and as soon as I could take the girl clothes off, off they came. I was so awkward and uncomfortable trying to pretend i was a girl; I never felt like one inside, even though clearly, physically, i was one.
Ditto on the therapist idea. You are the only one who can determine who you are. Questioning is great. If you discover you are truly a tomboy, great! There is no law saying girls have to be feminine or weak or what have you. There are many women in men's professions and the trades these days. But YOU have to be comfortable as YOU. If that means you are a rough and tumble girl, if that means you are lesbian (ie you prefer to date/fall in love with women, or if it means you really feel male and that your body is totally wrong for you, YOU are the only one who can decide that.
Good luck.