Why do I feel most peaceful when I'm alone?

I have met some crazy negative people over my life time. So suddenly I find solitude in being alone! But my friends who I dropped accuse me of being crazy because I spend most of my time alone. But I'm online, I read, I enjoy listening to music. I recently painted my house, I take more time sleeping and talking long walks in the park. I'm not alone staring at the walls. They think I'm crazy because I have inner peace! I only make time for things that make me happy.