Beast, Maine Strength nailed it. Join a health club and get fit. Get a hobby and get good at it. DON'T DO WHAT I DID !!
Planned on marrying my high school sweetheart after my Navy enlistment. Came home on leave and found out from her little sister that my GF had been cheating on me. Four years down the drain and I was crushed. Never thought i would get over it. Everything I saw, heard and experienced reminded me of her. Got back to the base and found out my fellow sailors would help me forget her with a little alcohol. Much of 1978 was a blur to me.
I bought a 1956 Chevy and wrapped myself up in a restoration. Met some new people and eventually got off the booze and found my direction again. That was a bad, bad year (except for the Chevy). I should have taken a healthier road to recovery but I was a mid 20's kid that didn't know better.
Fast forward to today. Been married to a wonderful woman since 1981 and can't imagine marrying anyone else. Believe me brother, there are some good ones left out there. God blessed me tremendously with my wife. BTW, she was a blind date. Go figure.
Sorry for the history lesson but I hope you get the point. Get in shape, meet new people, volunteer to help those less fortunate and please realize that you are unique and valuable to family and friends. It will get better, I promise you. I am praying for you.