Be more accepting of yourself and follow those passions. Nobody cares in your 20s what you do in your spare time, as long as it is something. There is nothing more boring than a person who has no passions and just exists.

If I was to redo my 20s. What worked was going to university in my mid 20s. I was able to finish it much quicker and made some close friends during by that time as well as set my career path going. What I wish I had done was move away from the city I grew up in. I only did it in my late 20s and I regret not doing it sooner.

Have lots of social interactions. It’s valuable. Set yourself up career wise. Always check to know you haven’t hit a ceiling where you’re working. Exercise and travel lots would be my key takeaways.

One tip, say yes more than you say no.

Of course, there are exceptions, but try to say yes more than you’d initially want. If coworkers are going out for drinks after work, but you’d rather go home and stream/game/etc, go out. Same for other social activities.

Get fit by finding something you enjoy that gets your heart going, track your spending, learn cook healthy meals, listen well and develop empathy. Good things will come.

Find exercise that's fun, that you will continue to do for the rest of your life. Exercise regularly. You don't need to get swole, but it staves off mental health better than anything.

Compare beers to sodas. If you would feel odd drinking 5 sodas in a row, you should feel odd drinking 5 beers in a row. Don't be the last guy at the bar/party.

Just build healthy daily habits.

Don't have kids until your 30s.

Let go of the small things and just be. It's not exactly "don't give a fuck," but it's close. Aim for meeting people and going out to do things, not necessarily specific people or popular things, just good people and things that are fun for you outside of the house. Realize you will grow and change a lot in your 20s, and so will everyone around you; so if you have a huge crush on someone your age that doesn't like you back that way, then tell yourself you might really dislike them in 5 years so it's not a big loss if they don't like you now. It's also OK to let friends go if you have an attraction to them that isn't returned, because you have to protect your mental health. It's OK to not drink or do drugs, but it's also OK to drink and do drugs... just don't do either to extremes and don't be extreme about not doing drugs/alcohol. Try joining clubs for different things, even things you've never done. Realize most people don't have things figured out in their 20s and that you can make mistakes. Make mistakes. Be well-rounded. It's cool to play video games and DnD, but don't JUST do that (especially if you want to meet women). Get clothes that fit properly, not necessarily expensive or cool clothes. A completely plain t-shirt that fits well (go to Target and buy every color of their Goodfellow everywhere V-neck T for $8 each) plus a pair of jeans that aren't baggy and some Adidas shoes is an outfit you can wear everyday that will look good and is so comfortable.

Take care of yourself, dress in a way that makes you look your best, and pursue what you want. Also be fun to be around. Moderately attractive and fun beats out hot and miserable nearly every time