Caught Myself Masturbating in Public - Help Needed?

I know this sounds crazy and I feel incredibly ashamed talking about it, but something weird has been happening to me lately. It all started a few weeks ago when I was out running errands downtown. There’s an alley behind the coffee shop near my office that I’ve walked past countless times without giving it much thought. But one day, as I was walking by, I suddenly felt this intense urge inside me. Before I knew what was happening, I found myself slipping into a private moment right there in the shadows of that alley. The sensation of touching myself and hearing my own breathing in such an unexpected place was thrilling yet terrifying at the same time. My fingers wrapped around my hardening shaft as I pressed myself against the cold brick wall for support. The texture of the rough surface added a layer of tactile intensity to the whole experience, making every frictional movement feel amplified. I ended up doing this once or twice more since then in similar secluded spots. It’s like something primal inside me just took over without warning. But now I’m terrified that someone could catch me at any moment, and the guilt is overwhelming. Is it normal to have such urges in public places? Should I seek help for this behavior? Am I losing my mind?