"We hate it when people don't call and it's something. We don't mind so much when you call and it's not anything. But when it's something and you don't call, we hate that. Hate that!"
Yes, you can actually use what you learn at dojo in real life - and not for self defense.
We train in how to roll and fall safely, mostly so that we can be safe as we're thrown after attacking our partner in class. However... it's also highly useful outside the confines of the dojo!
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Many people equate the phrase "self defense" with the act of physically defending oneself. That act, however, is actually the last part of self defense, and can in many situations be avoided by other means.