Do I have a social anxiety disorder?

I feel like you are shy because you have no confidence, do not love yourself for who you are, and care too much about what others think. That's great that you got a job! Look at it as an opportunity to kind of break out of that shell. Say the tag lines even I they are stupid. This will make you interact more with others even though it's not a real convo. It will still boost your confidence when talking to ppl! The most important thing for you to do is get yourself out of your comfort zone. Your not helping yourself by declining to hang out with ppl. You can make a goal to hang out with one friend every two weeks. Even if you don't want to. You will eventually get used to it and enjoy it more and more.