The biggest change, I think, is that I no longer feel alone. Not in the sense of not having anyone in my life, but rather that I now know people who think in roughly the same way I do about roughly the same things I do. To put it in jargon, I have, for the first time, an in-group, a tribe. This is not an effect you should underestimate.

I have also changed my life in some ways and my outlook on the world has grown more realistic, I think. I think about things differently and am more willing to make trade-offs rather than just be paralyzed with indecision. I'm more attentive to opportunities (in all areas of life) and I'm more willing to go for those opportunities.

The most specific change I can point to is that I use my free time a lot better. Used to be that I just sat around playing videogames I didn't really enjoy in full. I can now notice when that is happening and stop doing it, which is a huge improvement on several levels. (Sometimes I then start playing a game I'll probably enjoy a lot more or continue learning to program Python or work on my math skills in Khan Academy.)