This is what I've found 4 days of not being a nice guy anymore.

Girls love you. Girls who have been indifferent suddenly seem to like me. (3 girls seem to like me which I havn't noticed before, in 4 days) I started dating one of them. Just don't show even a bit of interest in a girl before you are sure she is interested in you.

You get more done. Just be honest and say no if you don't want to do something. I did that a couple times I wouldn't have, and none of them got even a bit angry at me.

It's all about facing fears in the end. Being a nice guy is safe, but it won't get you anywhere. I also faced my fears in other areas of my life.

I really feel like I am in control of my life now. Which I hadn't earlier.

Stopping being a nice guy is one of the best things I've done for myself. Thanks cannabis.com for all of your feedback. Without that I wouldn't have been able to do this step without all the confidence I did it with.