This piece in the New York Times is great advice for anyone young and struggling with networking. Is networking useless? Not at all. But like direct mail or many other forms of outreach, the effort to success ratio is far from 1:1.
If you are an extrovert, then you likely get something out of networking even if it isn’t a leg up at work. If you are are introvert, however, articles like that one are likely to make you never want to even try. For you introverts, I recommend you find ways to network that are pain free. You may not even have to directly talk to people: just be contributing to platforms that have alot of participants, you can get the benefits of networking. Networks are everywhere these days and embedded in much of the technology we use: take advantage of that fact to network in the ways most effective for you.
Hard work and luck are the keys to success. Networking is also a form of hard work, and if you work at it, it can bring luck! (After all, good luck is the residue of hard work.) Therefore include networking as part of what you are doing to be successful. Just hav the right expectation of what comes from such work.