Shame is an emotion that you have to deal with. I remember my first time, I went home and thought about what I had just done. I had sucked another man's penis and let him cum in my mouth and had swallowed it. A million and one things run through your mind at those moments, but later that evening, I thought.. what's the harm? I wasn't coerced, it was m choice, and more importantly, we both enjoyed it. So much so, I went back the next day for more on my own.
That next day, I let him fuck me. I came so hard during that encounter! Again, as I rode home on my bike with his cum leaking out of me, I thought, OMG, everyone is going to know. But no one was the wiser. I didn't walk or talk any differently. Nothing had changed except that I had found a new way of experiencing and giving pleasure.
Bottom line... there is no shame unless you make it shameful to yourself. Otherwise it's just really good sex!