Damn! I've just read this before I have to leave for work and I have sooooo much I'd like to say to you. I'll be thinking of you today and get with you this evening when I get home.
Let me just say for now...your cousin just wants to bait you into a disagreement because when someone is miserable, unhappy, insecure, etc....
It's easier to drag someone down to their level than it is to lift themselves up to be a better person. Let's face it...we've all been there and done that...including me.
I realize this is family, but that's not an excuse or reason to be treated like a doormat, but how you choose to deal with this relationship with your cousin will take some effort and patience on your part, and if possible, some distance. Ppl living together is a very hard thing for everyone on the face of the planet. You're not alone.
I'll be thinking if you and I'll do my best to get to you again this evening.
In the meantime...keep looking up and within, everything you need is right there.
TgrsPurr, xo.