I posted this same question a few days ago on /r/Advice, but I'd like to see what TRP has to say about it:

I found a meme earlier today, and it hit me on a level. Here is the meme; http://imgur.com/Xs6h7sT.

Here's a bit more info about it in case this helps. Basically, I [20M] was pursuing a girl a couple years ago, this is when we were both 16/17. Things didn't go quite how I wanted and it really fucked me up on a mental level, I'm talking depression, suicidal thoughts, the whole shebang. I'm kind of over her now, but like the meme says, I buried myself. I remember before it happened, I had a personality, I was outgoing, confident, funny, and I used to care a lot more about the things in my life. Since it's happened, I feel like I've lost my personality, and I'm a shell of my former self. It takes a lot more effort for me to be sociable and try to make friends and such, I'm constantly scrutinising my thoughts, words, and actions. I can't stand it anymore. I just want to go back to being the fun loving kid who his mates loved spending time with cause it would always be a blast. Not saying that people don't enjoy spending time with me anymore, it's just I can tell the quality of me now compared to before has greatly dropped. If anyone else was ever in this position, and found a way to break out of it, any advice would be greatly appreciated. I don't want to live the rest of my life being an empty husk of a person. If you guys could give me some actionable advice as well, I'd be very grateful.

TLDR; I went through some struggles that made me lose my personality, any actionable advice on steps I can take to get it back?

Edited for format