I'm sorry to hear about your situation - how disappointing and lonely it must all have been for you ):
Hang in there for the remainder of final year - It's never too late to make a friend! Even if not, graduating and going on to greater things will surely push you towards a brighter future.
I've not got to Uni quite yet but I stuggled making friends all through the second-half of GCSE and A-Levels (even slightly within my own career) but I make attempts to improve my situation and to find new oppurtunities to recreate myself.
If it's communication you struggle with then I really recommend listening to some podcasts about proactive listening - it really advances how approachable you are.
If it's anxiety then try some exposure therapy by stepping out of your comfort zone - try some mixers or look for online forums of people discussing hobbies that you like maybe?
I'm lucky at my homebase because I have a wicked group of friends but I found them when we were all younger. I will add that we were all outcasts, however! Try finding some outcasts and make sure to stay open-minded about everyones differences.
This all seems so hard right now, I'm sure. But, really, you're so young and there will be ample oppurtunites in your future to make friends - as long as you're ready to start making them!! I've been where you are and I found my people - I hope you'll be just as lucky as me (:
All my luck,
Bee