What do you think about me telling her I love you and I want a future with you?
Do you really want a future with this person?
Yes, I want to have a family with her.
That's good to let her know how you feel. Otherwise she would have no idea.
I have no idea what I'm doing, it didn't go the way I thought it would.
It's good to let your partner know how you feel. It will only help you both to know if you are on the same page and if you are both aiming for the same thing in the relationship.