To start taking care of my self. In all aspects.

The act of starting to love, appreciate and take care of oneself it's a very powerful life changer that can save and avoid you a lot of problems. From physic and mental health, to social relationships and to career/work and much more.

I feel and think life is much more enjoyable if you lookout for yourself and for others.

I more wish others had done me at that age.

Abstain from alcohol

Bought a house. The house I just purchased costs ~2500 a month. If I had bought it at 18, it would cost have 900 a month.

Even now, at 2500 a month, the rent price in my area for a 2Bed 2Bath shit box will surpass that cost in ~5 years.

Learned more about people's behavior, including my own, through (evolutionary) psychology, philosophy, history and so on.

How and why people (including oneself with this) behave the way they do is the most important thing I have learned in my life, unfortunately pretty late.

Still glad I've done it at all, many people never do.