Yes, it is normal. Your senses are no longer being dulled by alcohol and you're coming back to reality.
I drank alone, mostly, and was never lonely because I had the booze right next to me, my companion.
My mind worked overtime while drinking and thinking. But the thoughts were all pipedreams. I was out of touch with reality.
Give it some time. Maybe go to an AA meeting, you'll meet people much like yourself. Stick with the things you can relate to.
I do believe your loneliness will diminish over time. I'm still alone, but I'm never lonley now.
I understand what you're feeling. I felt the same way after I quit. Stick with sobriety and you'll see a whole new world open up to you.
Best to you, and keep posting if you feel too lonely.