Overweight?

I’ve struggled with self confidence since I was 12. In high school, I was 120, by the time I graduated I was 140, since meeting my husband and being on birth control I hit 180, I got pregnant with our little boy and hit 200, I lost it back by 6 week check up and was back at 180. Last time I weighed myself (6ish months ago) I was around 175ish. I’m 5’6”

and want to lose weight but don’t know what a healthy goal would be. I keep saying I want to be back to 140 or 120...Also could use some encouragement and positive vibes because I absolutely hate my body 😞 I’m always comparing myself to tiny size 0 girls.