Ugh! Being forced to pay tithing on something that is really more of a gift than income!

Anyway, I busk basically to make money because well I enjoy it. It makes decent money since I don't really have much overhead or cost of living. Anyhow, went today. May about $41.00 ad some odd cents.

My mother is making me pay tithing on t. Like whatever it's not that much money it's $4.10. I don't really need it for anything. I'm not exactly hurting for money. I do thing like hat weekly. Sometimes more if there's people around. Anyway, I'm just pissed that I'm being forced to do something. Thoughts?