Do you think it's a bit of an overreaction to block everyone of college because I failed one of the exams?

Sorry, but why would you block them because of that?
Bad memories
Failing an exam isn't the end of the world. you'll face much worse than that and have to figure out how to navigate that. Thats life.
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Wait what do you mean?
In WhatsApp group, I blocked everyone I knew from college
Because I'm a failure now
Oh ok is see what the issue is i am guess you have a bit of pride stored up.. now that you failed a test you feel like everyone is going to see you as lesser correct?
Probably
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