How to remove the regret of not having a good social life

I didn't really have a lot of friends in middle and high school. I had like 4 friends and always talked to these same people. I didn't talk to others due to social anxiety, even though I still got some fun with these people. I have one year before high school ends, and I regret deeply not having socialized more. I regret not hanging out with others and doing what teenagers usually do. How can I deal with the feeling of regret?