Keep busy, even when you really don't feel like doing anything. Socialise, even when you really don't feel like socialising. Ride your bike even when you really don't feel like riding……
Talk to people, don't fear of boring them, it's important to you, and if they're true friends they won't mind, just don't be offended if you can see their minds wandering – they still care.
You're still very young, focus on your course, things will get easier, and you will meet someone else – this in time, will just be a memory.
There are plenty of self help positive thinking books at bookshops, which shows lots of people go through, and get through these times. Buy one, or two even – it can help!
Best wishes
Pete aka Woodsman