knuckles and the heart

I was just thinking about when I was young and my dad told me not to crack my knuckles ( you know when people bend their fingers back so it makes that cracking noice).. he said everytime you do, it feels good, but it's breaking muscles in your joints, so it has to grow back over the broken parts, so when people crack their knuckles too much, their joints become too big and deformed. I dont want to do that to my feelings, you know.. potentially crack and tear up my heart if i meet a nice boy, and it could hurt so much and I'm afraid my heart will be like that- overly deformed and big, making my hands look old before they're supposed too.