What to do if im constantly zoning out and day dreaming and cant stop but would like too?

If you are zoning out and daydreaming, you're probably bored. You need to find something to do, not just anything, but an activity or topic that you are interested in, and that you would have to gain knowledge and skills to master. Find a 2nd activity requiring physical exertion if the 1st one doesn't. This is the best phase of your life. Spend it doing something you love and are passionate about.

At your age you should zone in on a career, a hobby and find girlfriends to hang out with or even a boyfriend to challenge your mind. Play a sport or chess to keep your mind active. Join a gym or get a job.

Start by seeing your primary care doc. There might be contributing medical conditions and non-medical conditions as they may be normal unless they interfere with your daily activities and having an assessment may help in clarifying. If using any recreational substances stop as soon as possible. Keep a log of circumstances, duration, etc that might help in better addressing such symptoms.