I'm going to kiss someone I know.
That sounds a little awkward? Do they know you want to?
I just love this person and I know that we're perfect for each other
You should make it clear to the person you intend to have a romantic relationship with them before kissing them. It can be weird kissing someone out of the blue with no context.
I'm going to tell her how I feel tomorrow anyway.
You should consider how she feels first, it might be sexual harassment if she doesn't consent. Perhaps you should tell her your feelings first before trying to kiss her?