Feeling of Pain
The definition of pain is a personal one. Everyone seems to have different ranges of tolerances. I remember one of my childhood friends said he didn't feel pain. So naturally, a group of us, kids, had him lay down, put a futon mattress on him, and then jumped on him. The result? Well, he looked like he felt no pain. Thinking back on it, we should have had my sister pinch him...
Pain is all perspective. Much of it has to do what you experiences you've exposed to. For me, I had two older siblings. Because of my sister, I like to think I have quite the resistance to pinches. Because of my brother, it takes much more to annoy or inflict pain to me (e.g spontaneous deadlegs). If you know me personally, you know I'm a lover, not a fighter; I don't use violence in anyway (read: I never fought back against my brother). So growing up, I like to think I was a punching bag (funny, because that's what one of my roommates from a couple of years called me).
Since I grew up with terrible dental hygiene and teeth too big for my mouth, I have gotten accustom to any "pain" inflicted by the dentist. It has come to the point where I don't fear teeth extractions or other procedures; I actually ask that no novacane be used because I find it unnecessary (the soreness and the sensitive tingling feeling while it wears off is annoying too).
Speaking of teeth, the problem with shark-like sharp teeth is when biting oneself. I have written about biting my tongue, but last week I bit my lip... This has to be one of the most uncomfortable feeling I have experience in my young life. I can't even smile without feeling discomfort! But that hasn't stopped from doing so. How can something so little be so annoying!?

It's so strange because unless you read this, you would have no way of knowing something is bothering me. I like be tolerant things like these while communicating with others. Everyone can sympathize for periods of time feeling less than perfect; we, as humans, tend to keeps those issues to ourselves. As such, it's always good to show compassion!