Self confidence issue

by Ano nymous
(California)

I am 23 years old. in high school I was outgoing I was kind I had more friends than I knew what to do with and I had at least 1 girl crushing on me at all times. Now that I'm done bragging I'll start my story where my problem began.

I became involved with a girl my junior year. She was a sophomore. I have nothing bad to say about her. She was great. Our relationship lasted 5 years. We broke about a year ago of course I was devastated for a little while and went through all the emotions that a broken heart bring out. Now I feel personally that this relationship tore apart my self confidence, my funk, my groove. She was a very shy girl and tended to get embarrassed by my personality. I will admit though sometimes I was a little wild but it was always in good fun. It's how I was. But as she became more comfortable with me she told me and being understanding I tried to not be so embarrassing.

This ultimately was the cause of death of my confidence. After time I just became antisocial. We spent all of our free time together.... For 5 years.... Well I guess 4 of the 5.
Now I have trouble speaking my mind. I have absolutely zero confidence talking to women.... Even my coworkers who I've worked with for over a year. Talking to new people period has become a challenge I've never before seen. It used to come so easy.
I've resorted to confidence boosters ( alcohol and cocaine to be specific) to give a temporary fix on my problem thinking I could carry it over to the sober world but that hasn't worked. Still drink because it's social, legal and fun but no more drugs.
I just can't seem to regain my confidence back. I cant really connect with my friends anymore and I definitely can't connect with women anymore either. We still share the same interests as we always have. I feel alone in my own self pity.
How on earth can I get my confidence back?