I don't understand why my family expect me to be stressed about my daughter getting married in November.

My brother sent me messages the other day about how stressed I must be. I told him not to bother because I'm not stressed.
She's getting married of her own free will to a man she loves very much. I'm not losing a daughter. It's not like she has been sentenced to death or anything. I'm happy for her, not stressed.
Jeez...if my own family don't know me by now then will they ever ?