Ok first off you are not anti social even in terms of just using it figuratively. You're clearly very introverted and need time to yourself a lot. NO one should judge you for that but many times we (I am introverted too) expect others to KNOW and understand our differences socially.

I feel that the way to at least try to do this in a positive way is to tell your mother that you care enough to try to give her time to talk and interact but explain and I emphasize this, putting this on yourself, that YOU need time to recharge, that it is not about her, that it is not that you hate people or being around them so much but it is very draining on your energy levels. Put the ball in her court by giving her the information you just explained to us. let her know KINDLY that you dont' want to hurt her feelings but that you need her to understand and hopefully accept that you need time alone and if you want to get out of there that it's not a lack of caring but for this reason alone.

From there see how she responds, see how she changes, if she does, behaviorally. If she accepts and respects you I Know this will work wonders for your relationship and your stress levels even! Maybe even do the same thing with the others in your house if you have trouble there.