Losing friends because of low social battery/job

Im 22F, never ever had a “big” group of friends. I have one friend. We used to go out all the time together. Now, I have a job where 90% of it is talking to strangers (I am a restaurant server) and hadn’t reached out to my friend in over a month. Didn’t even realize that’s how much time passed, I just get so drained socially at work every day, that I don’t even want to go out with friends…

I texted her last night asking if she’ll be going to a show in March (the last show i went to was In November, she has been going out every weekend. she is very much an extroverted person) and I could tell by her one-worded responses that she is upset with me.

I feel like a horrible friend, but I am so exhausted, on my days off I am usually sleeping after getting housework done. I know that I am not the most out-going person, and maybe not even the most fun to be around all of the time because of my low social skills. I wish I could explain this feeling to someone who isn’t introverted. Has anyone else been in a situation like this?