By this age, we have all been told "you're too young to know what love is" about a million times (just to approximate), but here is what I do know about love and matters of the heart.
1. Break-ups suck.
It doesn't take twenty years to learn this one. Whether you were together for two days or two years, no one likes to have their heart broken. It leaves you with this gut-wrenching feeling, like you have a void that only ice cream can fill.
Ice cream doesn't mind that you leave your socks everywhere. Ice cream won't judge you for the pile of dishes in your sink. Ice cream will love you the way you deserve. And after your rediscovered love for ice cream, you'll go through about 10 more stages of healing including flavors like chocolate, strawberry and sherbet.
but despite my full support of binge eating to heal a heart...
2. Break-ups are a great motivation.
Give yourself a full day of binge eating (I recommend anything that has carbs or chocolate) and watch a full season of whatever you're addicted to on Netflix (I am going to assume you choose either "Grey's Anatomy" or "Orange Is The New Black").
Then DO SOMETHING! Maybe start a new diet fad you heard about or start training to run a marathon. Get active and utilize the energy and emotion you've been feeling as a result of the break-up.
For some further reading on how to handle a break-up, check out this article.