How are introverts supposed to build a network?

I work in tech and go to trade shows or conferences now and then, but I usually end up keeping to myself. It’s not that I don’t want to connect with people, it’s just that walking up to strangers and starting conversations horrifies me. I never know how to naturally insert myself into groups or chats without it feeling awkward.

I know networking is important, but does anyone have tips for making it feel less weird or exhausting? Is there a more introvert-friendly way to approach it?