I think you need to seek professional help.
Who cares about other people? Most people come and go, just hold onto the good ones, if there is no one good, they are disposable, use their company to just keep loneliness at bay till you find better people.
People skip all the time. Are you sure they are mocking you and not just curious? I only suggest because a negative mental state, such as depression, can skew perception to feed it... cause depression is a monster. And the monster has to be tamed, preferably defeated, but I don't think real depression can... I think people who say they have never really had it....
Open a window, get some fresh air in your room and lungs. Trudge to your classes. Go through the motions of normalllity so when this passes you aren't thrown right back because people ask what's up with you? They don't understand. You can get through this, but it may take some help.
Take internet strangers words with a grain of salt.