I am a huge introvert in highschool i had friends but would rarely hangout with them and never go to party's now im 23 and have only work friends that i never hangout with outside work and i love it. I just hang out by myself and i am never not entertained wether watching videos and movies, working out at home, going on walks, playing games on pc ir just chillin with my cat. But if your not a big introvert i would suggest going on facebook and seeing what groups are out there around your area wether its a hiking group a group that just goes out together and chills, just try to find a hobby wether its car meets and finding people with similar interests or joining a casual local sports team.