It's important to build and maintain relationships in your personal and professional lives, but it's hard to keep doing that if you're an introvert. If you're struggling with deciding which events to attend and skip, create a socialisation quota.
Susan Cain, author of "QUIET: The Power of Introverts in a World That Can't Stop Talking", suggests that you stop the pain of decision-making by setting aside a set number of events to go to in a specific time period, which lets you prioritise your commitments, with the added bonus that you don't feel guilty when you miss out on others.
Instead of wrestling yourself every night for each of these invitations, come up with a quota system where you decide to go to these networking events once a week, or six times a month -- you pick whatever feels reasonable for you. And you don't have to agonise night after night to decide what to do.
You can use that kind of quota system in relationships where one is an introvert and one is an extrovert. Come up with a quota system as a couple so you aren't always arguing whether you are going to go out as a couple or stay in.
You can use introversion for career and personal success and Cain shares other networking tips for introverts in her talk with Marie Forleo in the video above. It's a good video, but if you want the quota bit, skip to the 10:40 mark.
Susan Cain: Networking For Introverts [Marie Forleo]