Socialising

I am 21 years old and I've been living alone the past few years. No family my friends are doing their own thing in a different country. The only social times I had was being at work talking with customers as sad as it sounds. I'm becoming kind of sick of being alone and it upset me that not many years ago I was an extroverted soul who had everyone. Friends, girlfriend and family. I lost all of it. What do you guys do when it comes to meeting new people? What are the best places to go to. I try as hard as I can to go outside. Obviously I do my own shopping and I go to the gym three times a week. I use any excuse I can to use my car and not stay at home. I just don't know what to do because the silence is absolutely killing me and I've only been talking to myself these past two years.