OP, as you have posted this in AIBU I presume you are genuinely seeking views and are not just looking for reassurance that you are normal.
You are normal, of course. It is common. YANBU to want to be spanked. However, if you are at all interested in feminism or women's rights, you may wish to consider the bigger picture.
M/f BDSM, even at its best, does nothing to challenge the patriarchy and everything to support it. At its worst, it actively teaches men (women, boys, girls...) that male violence against women is desired and desirable. I know that you would only indulge in violent acts with a loving partner in a mutually-agreed setting. But anything (adverts, porn, poorly written mainstream 'literature') that advocates M/f violence has the dangerous effect in normalising this violence. Not everyone receives or can understand a relationship which is equal and respectful outside the bedroom, but violent inside it.
You may not subscribe to the view that the personal is political. But you should also consider what M/f violence means to you and your partner. Is there a reason you enjoy this violence? A large proportion of BDSM desires can be traced back to previous events in a person's life. You may wish to look into trauma bonding and trauma re-enactment if you think this is relevant to you. And what will this violence mean to your partner? Will he become (is he already?) a man who is sexually turned on by inflicting pain upon a woman? Do you think this is healthy for anyone?
I know full well the flames of outrage that are about to descend upon me for this post. FWIW, I personally fantasise about being spanked and have enjoyed it in the past. But I know these fantasies are coming from an unhealthy place, and I no longer practice it in my sex life.