Some people say 'I haven't revised' when they've been working a lot. They may be doing a lot less or more than they say. Work out a realistic revision time-table, which includes time to do things you enjoy. If you do badly, it doesn't make you a bad person. Everyone worries about making friends even though they may look confident.
Some people have lots of friends - others are happy with one or two.
If you feel you don't have any it can be very lonely. It is also very common for friends to fall out. Sometimes you might feel different to other people. People can be on their own for all sorts of reasons - sometimes through choice, sometimes not. It doesn't mean they aren't nice or fun to be with, or can't be a good friend Stick up for your friends.