How do I know if I am transgender?

You kind of just know, I suppose. There's this feeling that you don't belong in the body of the gender you were born as, and rather the opposite gender. You may feel dysphoric in your body as well.

If you feel deep inside you that you weren't born the correct gender then you know. It doesn't have to be something you have known your whole life, but something you feel deep inside you.

Its how you feel. If you're a girl, do you feel like a guy? Want to become one? If you're a boy, same thing just swapped.

When you start acting like the opposite gender naturally, and you feel you were born in the wrong body, you don't feel right being you, whatever gender you are.

You would feel like the opposite gender more than the gender you were assigned to at birth. It's like you aren't yourself in your own body.

You are asking this it is most probably because you are feeling uncomfortable with your current gender. So that is a yes, to being a transgender. And also if you think your current gender is not the same as your gender in your brain.

you may feel like you aren't being who you are meant to be, like something in you is different in you rather than from someone else. Not like hairstyle or shoes, but that your life isn't how you want it to be. You should be able to be comfortable in your own skin, as you, and not as the wrong gender.

Most people feel that the gender that they were born, isn't what they were meant to be born as. Some have described it as feeling like they're not in their own body, like they're meant to be in a female or males body and generally feel uncomfortable with the gender they have been given. The definitions of transgender seem to support these claims.

it just depends.... you need to define what makes you happy and make your life based on that and just "fuck you" about what other think :)

Only you can figure that out. If you were born male or female and you feel like you were meant to be the opposite of what you were than you may become transgender. I don't think that you're transgender until you actually go through the sexual change, but you can start by changing your outside appearance to make yourself more of what you really want to be, like wearing the opposite sex clothes and fixing your hair. Then there is the process of taking hormones. The surgery is the part that every transgender person wants to get to and that just helps fully develop you into the sex that you prefer to be and it does cost a lot of money.