Goals and the future.... Sadness/melancholy?

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So I have spent my life always wanting to be a martial artist and devote my life to training. I never followed through. I have also always wanted to be a master mediator and a pro ssb melee player. I also need to continue writing my book. I know these all take years to be a master at but I need to get started and commit myself. I need to get rid of distractions like the internet and devote myself to training all of these things. The thing is... I can't hang out with anyone and it will be a hard lonely life style. It will be tough and the road will be arduous, filled with grief and loneliness and solitude. I can't help but feeling this sense of melancholy about my coming journeys. I have friends and a social life but it feels weird that I will have to leave all that behind in order to better myself.
Complete sobriety and I won't have time for women or friends. Just isolation and focus on my goals. It makes me sad somehow and idk why.

Idk general advice? What do I do to get past these feelings? What would you do? How would you approach this lifestyle? What should I do?