When it comes to evangelization and works of charity, some of the hardest workers at my church are introverts. Anyone with any temperament can find works of charity to suit them. I’m an introvert and work in the sacristy, mostly by myself, and love it. I have introvert friends who help clean the church or work in the kitchen or have other behind-the-scenes jobs. It may be uncomfortable at first, but you’ll get to know the small group of people with whom you volunteer and it’ll feel like “home” soon!
If a little bit of interaction with people appeals to you, become a Mass greeter or an usher; they’re sorely needed and you can get to know a lot of people quickly and it’s only for 1.5-2 hours a week. If you want to stretch your boundaries a bit, take Holy Communion to the home-bound, even if it’s just one person that you visit each week or so. God has given you many blessings and talents and you need to challenge yourself to continually grow in love and charity!