I pretend to be a guy online
Why do you want to act like a guy instead?
Because I can act like myself instead of how people think a lady should act.
It's understandable that you want to be treated for the person you are and not the gender assumptions people make online. But, pretending to be someone else could damage any online friendships you develop.
It's just a bit of fun.
Lying about who you are will only end up causing confusion and potential issues down the road. If people continue to treat you badly when you are honest about who you are, it's time to find new websites and friends.