How can I get my friends to leave me alone and stop making my life stressful?

I am a 21 year old college student studying at a university. I enjoy the college that I chose and I am very interested in my major. Things were going until my friends started giving me problems. My parent make very good money and own a few houses. They recently purchased a new house that they are moving too. They decided to give me a house that I can stay at during the rest of college and I can live at after I graduate. They told me that it is my house to do what I want with. It has 1 living room and 3 bedrooms. I decided to rent the extra rooms out to fellow students. The extra money is good but it quickly became an pain. One of my renters is one of my classmates and he constantly fails to pay on time and makes excuses. For example, he was a few days late on rent before I finally brought it up to him. He told me this. He said you know we studying hard for that exam last night why won’t you give me a break. A few days later brought up the rent again. He said I bought you a drink yesterday and you’re still asking for rent. That drink that I bought you was the rent right there. Another one that rents one of the rooms is this girl that often comes home drunk and loud at like 1 or 2 in morning waking everyone up. Some of us are sleeping or trying to study and she is distracting. If she wants to fail her classes that is her, but I don’t want her to cause me to fail. She pays rent very late too. When I ask her for it she gets mad. The only guy that pays rent on time doesn’t cause too much issues. The only issue with him is that he smokes all the time. I tell him to stop doing it in the house. He tells me he won’t do it again, but he continues to do it. One of my renters got so mad that I was bugging him for rent that he spray painted offensive words on the wall when I was in class. I hunted him down and told him if he doesn’t pay to get the wall painted back I’ll kick him out. I guess this time he took my threat serious and paid to get it fixed but he still acts like a jerk when it comes to the rent. How can I get my friends to allow me to study and enjoy my life? They make me want to pull my hair out.