Here are my answers to your questions. I hope that this helps.
1. I submit because I derive pleasure from pleasing others. I am better at following orders than giving them. Also the reward at the end is usually worth it. The praise, love, and care that is given to the submissive is worth it to me.
2. I was introduced to bdsm by my boyfriend. He was always the more dominant one and apparently had been into bdsm for years. One night at a restaurant he showed me an example of this hobby of his and I have enjoyed it ever since. There were some bumps along the way. At times he confused abuse with bdsm.
3. My bdsm lifestyle and regular lifestyle clash from time to time. My sub trigger is usually the way my master caresses me and then calls to me in a certain voice. It arouses and excites me and makes me wish to be his sub.
4. Sometimes I think I should find better masters. The ones I find tend to enjoy inflicting pain a little to much. I am a submissive, not a punching bag.
5. I left one master because he was much too violent.