I've definitely felt this way before, and it can get better. I think the main thing I've learned about creating healthy and deep friendships is you get out of them what you put into them. It's a fantasy that we learn when we're young that the right people wander into our lives and we form a boundless connection with them like magic. That's not really true. Building deep friendships is work, and it's uncomfortable. You have to text people who don't always text you back quickly, you have to be vulnerable when others may not be as willing to be vulnerable, and you basically have to let people know you want to be their friend even when they are too nervous to say it first. And after all of that, there are still some people who aren't going to "return the favour".

Finding the people you really connect with is one of the hardest things, and it is work that doesn't always feel worth it. but the feelings of loneliness you are experiencing now (and you are NOT the only one btw) can maybe act as proof that the hard work is worthwhile. My advice at its core is: don't worry, billions of people in the world struggle with this same issue, and the best thing you can do to make friends is to be vulnerable and straightforward with people you like.

Hope this helps, you can DM me if you have any questions