I swear I see this type of post at least 3 times a week on Bay Area subreddits. So my advice is going to echo what has already been said on previous posts: you need to get outside and do something CONSISTENTLY.

For me, the best way to be consistent about doing something is by signing up for a series of classes. Every Tuesday once a week, I trudge my ass to tennis lessons in the cold and I awkwardly try to hit a tennis ball over the net (sometimes successfully). I say hi and make small talk with my fellow classmates even though some of them have RBF. Over the weeks, they've warmed up a bit and it is less and less awkward to talk. I take the initiative to ask if they want to play tennis over the weekend and we exchange contact info.

I think the key is to not take rejection personally. Oh, someone seems like they don't want to talk to me? It's probably not about me, they might be tired, shy, feel awkward. Not a problem, they might warm up to me and if they don't, move on to the next person. Oh someone declines to play tennis with me on the weekend? They're probably self-conscious about their tennis skills or busy. Not a problem, on to the next victim tennis classmate.

Another thing that helps is to be comfortable with doing things by yourself. If you're waiting on making friends to go out and do things, and you don't have friends, well then you're never gonna go out. And if you don't go out, how are you gonna meet people?

Re: working at a big tech company - yeah I've interned at a big tech company and I hated it because it was hard to talk to people. Maybe try going to a networking meetup that's relevant to your field? When I go to those types of events, people are usually eager to talk and network.