Overcoming social anxiety

I’m pretty sure I have social anxiety, I dread having to interact with people I hardly know, I anticipate picking my son up from school

Because I’m afraid other parents are going to want to make conversation with me, I dread dropping my child off at birthday parties. It’s crazy because I work at a hospital where I’m talking to people all the time and I have no issue with it at all while I’m at work. My son has an xmas party at his daycare this Friday and I’m usually working so I miss it. But this year I am on Maternity leave so I am able to attend. They usually have a Santa come and give the kids gifts then they do up this amazing Christmas dinner for the parents and children. I don’t know why I’m dreading it so much, I’ve known these people for all 8 years of my sons life yet I’m still shy to attend this event. What the heck is wrong with me.