Lately I've been feeling the urge to hate being an only child.
Why would you feel like that?
It would be less lonely with a brother or sister.
Aw, I can understand that. It is normal and understandable to want brothers and sisters.
I just wanted to say that. I'm feeling a little bit better now that I talked to someone about it.
I'm glad you're feeling better talking to someone about it. Talking to people in the future such as a therapist could be beneficial to you. Not saying you need therapy now, but if it continues to be something that makes you feel down it would be good for you.