Purchase a gym membership but consistence is key. Watch youtube channels (AthleanX I highly recommended) to teach you to properly exercise. Exercise at home with no supplies doing pushups and crunchies is best to get you started. Remember, one day off becomes two days off and starts a cycle of laziness. DON'T DO THAT. But don't push yourself and know your limits. Relax when you need to.
Explanation: people with alot of stress tend to get less sleep. i see this kid at my school asking the teacher to give him a good report to his parents even the the student does terrible in class, so the teacher always gets annoyed and he yells at the student to stop asking him for a good report