This is perfectly normal during the beginning of your BDSM journey. Try not to worry too much. You are faced with emotions of a depth and intensity that just canīt be compared to anything in the vanilla world. It can be confusing and scary.

It will get better with time, given that your Dom allows you to communicate your feelings and takes care of them (if he does not, kick his ass, for he is not a Dom but a careless jerk).

Keep in mind this feeling of vulnerability and insecurity can come back at regular intervals - with me it does whenever I had an experience that went very deep or made me face an aspect of myself I had not been aware of before.

Again, this will go away over time if you feel comfortable and safe with your Dom.