Maslow's hierarchy of needs summs up why hobbies, jobs, and other things won't help
People who say hobbies/career, etc; will make you feel better are right to a degree, but not for people in our situation. Before Esteem, and self-actualizaton is Love and belonging. A lot of the people I see on here haven't really gotten that love or belonging from friends/family and so we lead towards someone else (partner) filling that void.
Without that, your esteem goes down and growing to be someone even better than your current self isn't really something to care about as much. Once you have that sense of love, hobbies like a sport, you'll eventually start to getting better with over time with, you'll become more confident, and finally happier.
I'm sure there's outliers to this logic, but for me it does feel a bit relevent. Just thought I'd share in case others had similar thoughts.