I'm 13 years old, female, overweight, and when I urinate it really hurts and there's blood. It's not

I'm 13 years old, female, overweight, and when I urinate it really hurts and there's blood.It's not period blood because I've already had my period this month.When I urinate, it really hurts. It doesn't sting it cramps up, like I'm on my period but it hurts where I pee.I really need help.