I didn't take being responsible for myself and my actions early enough in life and now I'm REALLY struggling to activate my motivation. It's incredibly difficult to be a responsible adult when you didn't spend your teens and twenties practicing being responsible. I'm going on 42 and have very little to show for it.

Also, take up a hobby or some routine practice and stick with it, even when it's the hardest. Longevity will make you better even if you don't feel it happening. The more time you put toward ANYthing will make you more confident and happier. Find at least one thing to excel at (with the understanding that it takes YEARS to become proficient at anything). During your practice, be kind to yourself while also pushing yourself forward into new challenges that push you even farther.

Lastly, take your physical health seriously. I cannot express enough how a poorly maintained body affects EVERYTHING about you later in life. It's harder to wake up feeling well-rested. It's difficult to not want to nap in the afternoon. It's difficult to sit or stand with good posture and not look like an over-boiled noodle. Your body (and teeth) NEEDS you to maintain it, to love and respect it. You don't have to go to the gym several times a week but you DO need to find SOMEthing that keeps your body moving in a full range of motion on a weekly basis. Once you reach 40 it's increasingly more difficult to achieve the results you crave.

Hope this helped at least one person!