Starting to Transition to formula

I have been doing ALOT of thinking about breastfeeding, and how awesome it is that I can breastfeed on demand whenever my little girl needs too. I really enjoyed the bonding experience the first 4 months, but since the beginning of October I just have not felt like myself. I started medication to help my with PPD back in August and it has helped wonders. My goal for breastfeeding has been six months but at first it was only two months, than once the two months passed and I wanted 6 months then I was like well how about a year. As i am coming up on 5.5 months I have noticed that since October my moods have been really up and down. I feel great for a few days then I start thinking about how i cant completely enjoy doing anything because I need to breastfeed every two hours, and it makes me feel sad then I feel selfish for feeling that way. We got accepted for 10 cans of formula per month and I think I really want to switch, but for some reason I feel like I am going to disappoint everyone and I just feel weird. I dont have anyone that I would disappoint but for some weird reason I feel that way. I am literally a few weeks away from my goal of 6 months and I am so proud of myself but I am seriously so nervous of what everyone will think of me and why I am not breastfeeding on demand if I am a SAHM. I just want to feel mentally good all the time and I am wondering if I will start to feel better once I completely switch. I dont want to pump because I tried it and it messed with my supply. I know alot of you moms might hate me because of this and I really hope not but I just need to do this for my own sanity, and waking up every two hours at night is killing me. 😥 any tips from moms who have transitioned that will help me and help ease my mind?