I talked to Mom about it on the way home from work. "I don't know how to say this without sounding mean and I'm sorry, but it feels like you don't believe I can make my own decisions. Like when you open my absentee ballot or you monitor my bank account..." I believe I also uttered the sentence "I'm the baby, but I'm not a baby." She seemed receptive. I doubt it'll make a difference, as I've had similar conversations with her before (the one with my brother this weekend was just "Oh. I care about you, so I tell you what to do. No, I won't stop. You need my help"), but at least I said it.
Then I got out of the damn house and got away from the doubt for a while. Now it's 9:34 A.M., I'm alone in the house and cozy in bed, and I have a snake in my sleeve. Life is better.