When I was in my early 20s, I lost around 45 pounds (at the time M20, 5'9", 205>160). It took me a couple of years to adjust my self-image to my new body. I still felt like a bigger person. People reacted to me differently in social settings, and I wasn't prepared for it. I worked with a therapist and learned to accept that people's positive reactions to my appearance were real. I kind of faked it 'til I made it... I told myself I was attractive and that people found me attractive, even when I didn't feel that way. Eventually, my perception changed. For example, at the beach or in more intimate settings, I was treated like an attractive person, and eventually, I started to see myself that way. The funny thing is, even though I've gained and lost weight over the years, that positive self-image has stuck with me, which is a good thing.
I'm not trying to shame anyone, and I still struggle with my weight. I sympathize with people of all sizes dealing with self-perception issues. I wish you all the best on your journey, and I encourage you to consider talking to a professional about your feelings and self-image. It helped me tremendously. Major weight loss is a big deal that can be tough emotionally.