I have not been into this for very long, so what I say is only from about a year of experience.....
Please be careful! I would think that even a new dom would know to go slowly. Using something that is a hard limit for you as a punishment does not seem like a good way to establish trust. I am also a pleaser and know how hard it is to say no - but you have to learn that to be safe. How can you trust when your boundaries are shattered?

That doesn't mean that you can't learn to experience something that you once thought would be off-limits. But that takes time - both for you and your dom. Insist on open communication. Make sure that your safe word will be respected if you get into a r/l situation. Remember, this should be for mutual pleasure. Otherwise it's abuse, and you should run! You are young, and the right person will come into your life!