How can I relive my anxiety?

I am a highly anxious person, and I can't get over it. I let everything get to me, and think every bad mistake I make changes my life. I have never had a girlfriend, and I always have this thought in my head that I will never find somebody. Everybody has a dream in life mine is simply to do what I love, and have a good family. To be honest though, right now I couldn't handle a girlfriend with all this anxiety, and stress I face. I can't keep my head on everyday, I have thoughts continuously throughout the day that I am going to end up a screw up, and amount to nothing while being alone still living with my parents at 40. I really want to turn my life around, but I know I can't do it with all this anxiety. I have made so many stupid decisions in life, and have let the good decisions I was too blind to see pass me by. Im 20 years old, and just started community college, and im ready to find myself, and stop worrying about every damn thing. Right now though I just want to see if anyone has any tips to calm down, and stop freaking out over every single thing every single day.
How can I relive my anxiety?
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