El Freako is right. Keep it simple. Legs, push, pull. Do a deep knee bend, put something heavy overhead, pick something heavy up off the floor. In every workout lift more weight or the same weight more times than you did last time.
Are you a gym member or working out with your own equipment? If a gym member, get a routine and shown through it by the gym staff. If you have your own equipment, tell us what you have and we can suggest a routine using that equipment.
However I suggest you join a gym. You have a history of quitting when doing it on your own, so obviously being on your own doesn't work for you, if you have instructors and other gym members to encourage you that'll help a lot.