My friends from Sixth Form have abandoned me?

Trying to keep this short. I'm female, 18 years old, and recently finished my A Levels at Sixth Form. To put it bluntly, I was deeply unpopular at school, mainly because of my introverted and quiet personality and a general fear of people :S I did manage, eventually, to make a few friends in year 13 (after spending the majority of year 12 alone). We swapped numbers and I was really happy, so I was actually looking forward to the summer. Now, it's been a few weeks since the exams and ... I've pretty much been completely abandoned! I tried to text them and keep in touch, but it was always me initiating them, and one by one they stopped replying. This included the one person of the few who I thought I was most likely and really wanted to keep in touch with, because we had lots in common. :( I just feel really, really hurt. Why do people throw away friendships like this? I've given up trying to contact them now, and I'm really frustrated. I've never really had any friends in my life and I thought I had a glimmer of hope with these people, but nope! Back to a lonely existence. I don't know why people just don't seem to like me? It's really upset me that they don't want to keep in touch. I keep thinking over the fun times we had in the last year of school and it really, really hurts. I want it back so much! Sorry this got long. Just wondered, anyone else in or have been in the same boat? I don't know what to do. :(

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