How do I become a serious adult?

I’ve been really frustrated with myself for the past few years because I haven’t been able to make anything work for myself. I’m at my wits end here and would really appreciate any advice I can get.

I played football in college and got my masters and bachelors degrees. I didn’t play anything meaningful or start a game during my tenure though. After college I got a job in sales which was going well for a while and then the org restructured and I got shafted out of a promotion to management. I was making over 6 figures at that point.

Since I was going to get fired I could smell it, I went on disability until I could find another job. I didn’t get promoted or really have anything to show for the sales job.. I had to move back in with my mother and I took an entry level job in IT. I like IT a lot and want to become a devops engineer down the line.

I am currently in my second IT job making about 85k. I have my own place I’m able to pay my bills. I’m overweight but I lost 50 pounds in the past year and will continue to do so. The only problem is I’m 29’years old, I have had 0 success and I’m behind.

I don’t date and I don’t have any friends at this point.
I’m really embarrassed about where I am in life/ don’t know what I need to change about myself.

I guess my question is, I haven’t been able to do anything or accomplish anything in my life. What do you think I’m missing? What do I need to change about myself?