How do I improve myself after a breakup?

I just went through a break up with my ex of 2 years who was basically my best friend. I want to improve my life becuase I'm shy my whole life, I don't have a lot of friends, I'm insecure about my height (5'6-5'7), and I'm about to graduate college but I'm kinda nervous of how I would fare in the real world. I'm also feeling I won't find anyone else because I want to have a serious relationship and it could be hard to find someone in the real world. Any advice of how I can get through this breakup? Also how I can improve so that if i do get another relationship, I can be the best for her?
How do I improve myself after a breakup?
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