Do you think it's bad if I pay someone to write all of my college essays?
Yes that's very bad! Why would you pay someone to write them instead of writing them yourself?
I not very good at writing the essays and I want to get a good grade in my classes.
You shouldn't cheat on your school essays. It is pretty dangerous to buy essays online because usually, professor can tell from your previous writing that the purchased essay looks different. You will get caught and get expelled from school which is even worst than a bad grade.
I know other people that have done this and it's been fine. They didn't get into trouble.
That still doesn't make it right. You need to do the work for your classes yourself. The point of college is not just about grades, but how well you have learned the material.