I feel really strange. I just got laid by a 44 year old. should I feel like this?

I'v just turned 18 and I was walking home from a friends house..and some came onto me. She said "your a handsome one". she put her hands down my trousers abd felt it....the grabbed my arm and led me to an alleyway. I didn't know who she was but I just agreed, the only thing I asked her was her age. I then ****** her down a dark alleyway and came in her...but before that I was a virgin. I feel so weird now. as soon as I came I walked off immediately.