How do I start focusing on my life, and not getting into a relationship?

So l've had a handful of situation ships over the past few years. However nothing ever came of them. One girl moved out of the country, another one moved to another state, I was talking to this girl for 8 months long distance; we met up and had an amazing time; only for me to find out after that she was engaged the whole time and it absolutely crushed me, I've recently had a few dates where we were having a good time so I thought only for them to message me and say that they didn't think we would be relationship compatible just because I have high energy. I know I need to wait for the right girl, but I'm so lonely. I so badly want to spoil a girl and treat her right and make someone happy alongside with me. They always say just be patient and you will find someone, but it's been 25 years. Although I wasn't really trying until about 4 years ago when I started getting serious on my quest for love. Someone tell me relationships arnt all sunshine and rainbows. How do I start to not care so much and just work on myself in the mean time?