I'm kind of the same way, so perhaps my advice might help. I'm normally dominant in my everyday life and I hate not being in control. Also, as a man, there are certain societal pressures that make me feel as though I'm "supposed" to be dominant or in control. It's something that has been ingrained in me by my peers growing up. I feel like these types of things cause me to be totally embarrassed about being spanked or being submissive. Here I am, this guy who feels all this outside pressure to be in charge, to act macho, to not appear weak or vulnerable, etc... And wow, how the tables have turned when I find myself draped across a Woman's knee with my pants down being spanked like a child. Complete 180. The idea of having this being done to me is very taboo for me and so outside of my normal everyday comfort zone. But in my opinion, this embarrasment and shame I feel is, paradoxically, the very thing that fuels the desires to be spanked, albeit in somewhat of a convoluted way. It feels so wrong and that's part of what makes it exciting for me.
Being spanked is just like a guilty pleasure or a song that you hate so much, but you can't stop singing it in your head. It doesn't necessarily have to make logical sense as to why it arouses you. It just does. You like it. So accept that and just have fun and embrace it, as others have said. You can be discreet about it if you want. It's not like you have to tell the whole world that you want a spanking lol.