Don't let your dominant's words and actions get to you, and maintain your self-respect. However, remember that unless you communicate with your dominant, he or she will simply assume that you're satisfied with how your relationship is going. Of course, if your partner don't respect you enough to stop overstepping your limits, respect yourself enough to end the relationship.
Don't expect to read a few articles on the Internet and then be able to call yourself a submissive. No matter how eager you are to learn and experiment, you won't become a submissive overnight. Becoming a true submissive takes a great deal of time and patience. In fact, many submissives may even go through a formal "training" period, which can take months or even years.
And if you do decide to open this new chapter in your life, have fun with it. You may choose to close it in the future, or it may become a big part of who you are. Either way, learn what you can from the experience and, most importantly, enjoy it!