Breakup advice please help

Okay so im breaking up with my boyfriend of 3 months tomorrow and I have no idea how?. The reasons im breaking up with him is because im 17 nd im not looking to settle down any time soon but I think he is and i've seen him literally every day for 3 months and he used to sleep over every weekend until my parents actually had to say something. That's another thing he is very rude and doesn't know how to keep his mouth shut when he needs to. Ik it's stupid thinking but I want to do it with as little conversation about it as possible.. I jut want to break up and be like bye but idk how