Say you only are given one penis. Please get it checked out. I riased 3 boys, trust me your parents will be understand and be helpful See a doctor...........a doctor visit is cheaper than a long hospital stay if you wait too long
I understand this must be painful, maybe frightening - however - being your own doctor is not advised and attempting to do so may prolong your suffering or make things worse. Stay calm, speak with your parents about it - or at the very least - seek out the advice from the right person at school such as a school nurse. The sooner you do, the sooner you will be feeling better.