Having a hard time

I gave birth 3 weeks ago and I have been struggling so hard to accept my postpartum body. This is my first child.. I was 120 before I got pregnant now I’m 146. I lost 20lbs after having my son. But I literally can not fit none of my clothes. So my aunt took me shopping and I looked fat in everything. I have back rolls now.. I don’t even want to go anywhere cause of the way I look. I thought I would snap right back. I decided im going to go on a fast and drink nothing but water and do some small exercises until I can really work out in 3 more weeks. How did you learn to feel comfortable and confident in your postpartum body?