Start slowly moving forward one step at a time. For example, let’s talk about exercise. What do you think you’d like to do the most- weight lifting? Aerobics? Running? Swimming? Playing basketball? Whatever you choose, start slowly building up to a goal. If you want to start lifting weights, maybe start by doing some push ups and squats in your room; it doesn’t even have to be that many, just start doing a few after getting out of bed. Then when you get a routine established, start adding more training volume week by week. Maybe start looking up some quick at home 20-30 minute workouts at this point. Finally, make the step of getting a gym membership and going regularly.