My bet is that no matter what you say unless you have DEXA scans or water displacement tests that you're fucking fat.
But if that's not the case, and maybe it's not
1. The guy that says MoneyMaxx is right. Money will go a long way. The money I've spent on truly attractive escorts, mostly outside of the US, is well spent.
2. Since I'm on escorts, to pull out the word above, truly attractive, even the poorly performing ones I still am happy to have fucked them. You have to go outside the US though in most cases which takes you back to money.
3. The guy that said stay in school and get a career I also really reiterate. I really enjoy where I work because of the competence and teamwork of the people around me. What I do is enough intellectually stimulating often enough that I don't get the nihilistic staring off into the distance that truly repetitive work gives you. I have enough space in my field to move laterally in ways that would still be satisfying. The lower down you are on the Job Hierarchy ladder the more you're just going to be executing tasks in a repetitive way someone else defined and the more you're going to be surrounded by trash.
4. Stay in shape - the older you get the creaker you get, the more sore you get, the more stuff starts to not work. Sedentary lifestyle will lead to a weaker body and it's not good to have a weak body and ill formed habits. This includes cardio. Stay sub 20%, preferably sub 15% body fat.
5. With the above learn to cook to save money and exercise more control over your diet. Eating out all the time is impulsive and harder to control.
6. Stay in touch with family including extended family.