How to find out your gender?Watch
Most transgender people will know that they're not the sex they were born as. It's not something they have to figure out, but it's something instinctive, that they were born in the wrong body.
You might not feel very feminine, but you're still a woman, and that's ok. With the rise of social media, a lot of young people are told that they should experiment with gender and sexuality, but you don't have to. It doesn't matter anyway.
OP, people here won't care about their differences its horrible but they are heavily transphobic. Please consider the lgbt switchboard site I commented they can offer advice about gender identity or contact other help lines. I'm really sorry you are being met with this.