I second Moses119's reply. There are so many people who overcome SA. Not just a little social anxiety, but severe social anxiety. I try to constantly remind myself that there are people out there, like me who are terribly anxious or have been terribly anxious.
One example would be Anna Clendening, a girl with an anxiety and depressive disorder - someone who was BEDRIDDEN from her crippling disorders. She went on America's Got Talent and beautifully sang "Hallelujah". You should watch it. It's beautifully chilling and moving. Watch her after she gets through the song - she is completely shaking. But she was amazing. People applauded her. I cannot imagine.
Maybe that's too big of an example though. I think it's important to look at examples of people you actually know. For instance, I work at a huge grocery store and we have a lot of managers we interact with several times throughout the day. Each of them are quite different, but I noticed that they aren't all perfectly confident. One of them is quite apologetic about everything, always trying to make sure everything is okay, making sure she hasn't offended anyone... Her being there actually makes me feel better

I say to myself that it's okay if I act a bit anxious - heck one of the managers seems a bit anxious. It really reinforces to me that I'm perfectly normally and not everybody is the same.
One of my college professors also said she takes medication for anxiety (me and the whole class is really close to her. You'd have to know her). She cancelled class once and admitted to me that it was a mental health day. She's a prof. of education - she used to teach in middle school. I'm going into education too - and of course, because of my anxiety, I've really questioned if it was the right choice for me. But my professor has helped me see that nothing should stop you from pursuing your dreams

Yes, we have bad days. Those are bad days, and SA or not, everybody has them. You are here to live for the good days. Even if they seem distant.
❝You must live in the present, launch yourself on every wave, find your eternity in each moment.❞ -Henry David Thoreau
I like that quote. I take it to mean that "waves" - the good things and happiness in your life aren't always plentiful. But when those waves do come, you should take advantage and thoroughly enjoy them.