My dear, I hope your people appreciate you! It sounds like they are very lucky to have your love and support.
Having a new baby changes EVERYTHING...don't be naive about that.
Take it easy. Find things that give YOU joy. Take good care of yourself. Keep YOUR plate full and then you will not feel shut out.
This will not be an easy road and expect the nuclear family to need to bond with the baby. Things will ease up after a while and get back on track.
As far as expressing love...men sometimes fear that expression...they (some) want simple things...no drama, it scares them. Express it any way.
There is love and there is fear. I vote for love.