Losing weight

Hey guys so I'm 18 I'm 5"8 and weigh 172 pounds.......I have stretch marks on my inner thighs and faded knew on my hips. I was anorexic about 4 years ago and have recovered but I just can't stand to look at myself....My boyfriend says that I'm just fluffy and a good pillow for cuddling which makes me laugh but I would like to be about 140 pounds....any help would be appreciated or maybe if people want to start a kind of motivation group to help each other out with eating and working out at home