When I bought my first mando last April, I must have popped three E strings and an A within the first month of playing. I was continally buy new strings and had a bunch of incomplete sets in the end. I asked the man at the music shop what I was doing wrong and he advised me to "stretch" the strings. In other words, tune the mando gently and frequently. Take your time and the strings will eventually "temper" a bit. Don't make changing your strings a rush job, either. In fact, I just changed all my mando's strings on Sunday without any of them popping or poking me in the fingers or face, etc. for a change. I'm actually quite proud of myself. Patience is a virtue.
You are only young once, but you can be immature forever.