I'm a 21 year old university student, and feel so lonely (even with so many friends)

I'm a 21 year old student at a big uni in the UK. My life is fairly ordinary - I study a lot, go to the gym, go out with my mates (3-4 times a week), and have a part time job.<br><br>I feel so lonely though. I have 3-4 mates who I consider to be my closest mates (we all live in the same halls at uni) and we will often go out clubing etc together in big groups (around 20 people). The problem is, even though I have lots of mates to go out with, I don't know any of them that well. I feel like I have no one to talk to being 100% open and honest with.<br><br>I'm very introverted, which makes it extremely hard for me to make friends (I'm very shy and can't talk to strangers a lot). The only friends I have are those that I met in my first year at uni. I would being to make new friends, but the more I grow, the more I feel like I want to get to know people on a deeper level and start having genuine conversations.<br><br>I feel like I'm just going through the motions every day and drifting through life in a haze. I don't know how to escape this feeling of intense loneliness and I'm not sure where to go to talk about it. I don't really know any of my friends that well enough to open up to them about it.