anal bleeding is this something serious what should i do?

well i am 17 years old and for the past week i been notice when i do poop a little of blood comes with it and also when i clean up the paper has a little blood and its being incising little by little and today was worst i did a little of poop but a lot of blood came out but this time not with the poop what should i do or what do i am kind of inverest to go to the doctor or tell my mom?
and also nothing hearts or anything