I am sorry to say no “you” can not just fix a rotten tooth. It also will not just go away. It will however get worse with out treatment. I do not know why you state you hate dentist. Poor Dentists they get such a bad rep. They are there to fix your teeth so that you can smile and not have your teeth rot out of your mouth.
I also do not understand why you would not just tell your mom or dad. They only want you to be healthy including your teeth. If you wait until it is a bigger problem don’t you think they would be more upset with you then.?
Do what is right. Tell your folks what is going on with your tooth. They are in theory the only ones that love an care for you the most.