If you are an introvert, this is exactly what you need to do. The introvert/extrovert is not really about how outgoing or social you are, it's about how you need to recharge and regroup--introverts need time alone to do it; extroverts need interaction with others. Wanting to be alone sometimes each day doesn't make you anti-social at all--you're responding to what you body, mind, and soul tells you you need. Embrace the time and use it.