No, you don't have to do anything you don't want to...SHOULD you continue to network? Absolutely.
Try to help undergraduates just like people helped you. Try to reach out across groups, across banks and continue to build a strong foundation that can help you get a new job should you suddenly lose your current one. When you only try to network when you need something, you'll soon find that there are less people around when you need that help.
If you build meaningful relationships and network as a way to continue learning, you are significantly more likely to have more options and more success throughout your career.
Learn to enjoy networking and embrace it. You will thank us in 10 years. Remember, networking is as much about what you can offer, not just about what you can get out of an interaction.