I'm a little embarrassed about writing this post but I have to ask and get feedback! I'm in my early 30's so you would think I would know the answer to this by now but are breasts really THAT important?

I've recently lost over 70 lbs in the past year and trying to get readjusted to my new body (I lost weight intentionally). I'm feeling absolutely self conscious and I don't even want to have sex with my fiance because I'm ashamed of my breasts. They went from AMAZING and FULL to almost non-existent. I feel like along with the weight loss went my breasts and my womanhood. I don't even feel like a woman anymore. Does having small breasts make a woman less womanly? Less attractive? I'm afraid my fiance will eventually stray to find a woman who is more curvy and more like a woman that I am.

Does anyone have any words of wisdom, honest thoughts or advice?