Before I start writing, I want to reassure you that I too have felt the same as you at one point.
There are two scenarios that could happen right now.
The first, which is the one myself and you will be hoping for, is that your friends are experiencing post-exam burnout and genuinely feel drained to make any social commitment. Like many students, they will be going through a kind of hibernation at home to recuperate and regain all the energy lost over exam season. As time passes, the urge to meet each other will eventually be rekindled and you will all be back to your regular selves - though this process happens at different times for everyone so you should be patient.
The second scenario is a harder pill to swallow. As critical events happen in life, and this goes for the entire lifespan from childhood to adulthood, we're thrown and tossed around in the waves of change. There are some things we can hold on to and keep as the status quo, like family relationships and personal attitudes/values, but other things inevitably slip out of our grasp despite us not wanting it to. And unfortunately, friendships are subject to these changes. People change and prioritise different things, find other interests... but this should never mean you need to change to keep up with them and try to change their mind. No, you'll simply be walking on on another path, just like them, and meet new people, make new experiences, laugh, cry and smile in ways you have never done before. Wanting to cling to the past because it's comfortable is something all humans are guilty of, but it is only after you dive in head first to the deep end that you realise it isn't so bad, in fact, it might even be better.