It's ok to have sections in your life where you prefer being alone/quiet time. We change & then change again. There's nothing wrong with being alone, unless you are feeling lonely.
We live in a culture that makes us feel that quiet is wrong, that not being busy-busy is wrong. Trust yourself & your instincts. I suspect that as soon as you accept this moment of yourself, it will shift.
I often happily spend whole weekends alone in sobriety. And sometimes I happily interact with people & really enjoy myself & then am done.
Tonight I went to a show with a friend, danced and enjoyed myself, but was ready to leave after the second band. So I left. Now I'm sitting on the porch with SR, & am happy. Just listen to yourself & honor the quiet inner voice.