Mixed up about not breastfeeding?

I recently stopped breastfeeding my almost 9 month old baby. She pretty much weaned herself because for about the last month and a half she would just get on the breast and play for 5-10 minutes before quitting. With the exception of in the middle of the night she has seemed more interested in the bottle and solid food than the breast. Yesterday I decided officially to quit altogether and start taking a weight loss supplement. I have been going back and forth in my mind as to whether I was ready to quit for about the same time that she has seemed to prefer solid foods. Every time I say "OK.That is it. She seems like she is pretty much done with it aside from comfort at night, so I am going to just stop." I start to feel confused and a little depressed. I know that its normal for me to feel this way and I am ready to do something for me (jump start my weight loss) since she is mostly wanting solids and formula and only asks for the breasts once every day to 2 days. My question is for moms who have breastfed. When you decided to stop, did you experience confusion and depression? Did you feel a little guilty even though you knew your baby was ready? How long did it take you to overcome these feelings and what did you do to help you feel better?
Please do not try to talk to me about the weight loss. I know what I am doing and I am taking all natural supplements without caffeine or ephedra. This question is about personal experience of when you ended your breastfeeding.
Thank you.

And yes, she has shown a preference for the bottle. I think that its possibly because it is easier for her to get the milk. Also maybe because she gets bored on the breast as she cannot do other things while breastfeeding, like play or look around at things.

I hope you can ignore the rather bias opinion above about formula feeding above being 'bad' (although formula does take poo into a different league I agree, but she's already on solids so you know big poo's!). My child has been formula fed since about 6 weeks, as she wanted feeding every 20 minutes for the last 48hrs and my health visitor actually bought me the tin so I could get some sleep!!

In the UK they only recommend breastfeeding until 6 months and I completely agree that breast is best at the start of a child's life to prevent diseases, but millions of children around the world (including most of our generation) were formula fed and you don't see them/us complaining.
A mother has to think about herself too, and I'm sorry but my baby is 7 months and I would be AFRAID to let the little monster near my boobies now!
I felt so guilty at first but when your breasts dry up and you can start having them back as your own 'puppies' again, you will feel so much better and your little darling won't miss them for a second.
You're not just a mother, you're a woman too and I guarantee within a month everything will be fine and you won't look back!

I personally think you should keep breastfeed her for another few months, formula isnt going to do her any good, if anything it would make her poops stinky and more reoccurant.
Babies at that age are more interested in playing regardless which way you go, Try small games like this little piggy, and teaching her the names of body parts while you feed her.
But! regardless, your going to do what you feel is right, you've been naturally feeding this baby for 18 months and now all of a sudden you've stopped, so your loosing those extra endorphins your body releases while feeding your baby, try taking in more B vitamins as they are known as the happy vitamins, and try to get more sunshine in the day.
Here is a 101 reasons why you should breastfeed rather than formula feed. http://promom.org/101/

i quit breastfeeding at 4 weeks because i had mastitis and it had abscessed once lanced i had to be on pain medication and couldn't breastfeed so we put her on formula. the week before we were trying to get her use to it during the day for a couple of feeding for when i went back to work. now that i am not breast feeding i feel guilty and depressed once in a while even though i bottle fed my first one. so i give it up to you for going to 9 months...breastfeeding actually helped me lose weight though now i've quit i'm gaining it back.

She doesn't need your milk anymore, but she does need formula? I think you might feel better if you were honest with yourself about having weaned her.