What is my anal bleeding being caused from?

Every time I take a crap, I’ve been bleeding. this has been happening for at least 6 months but it’s been every time for the past month or so. When I sat to pee today, I guess from the pressure caused it to bleed. It happened 4 times today. I’m beginning to worry, since there’s a fold of skin sticking out too.
could it be hemorrhoids?
Please help. I’m a 17 year old girl.
oh, i drink plenty of water daily. about 2-4 bottles and my diet hasn't changed since before ive had this. could it be an external hemorrhoid?