What is something I have always wanted to try but haven't yet, and what is holding me back?

I wanted to make a beautiful body from old past, = from the past that looks healthy and thin.
When I was thin in the past, I had less = fewer muscles because I didn't exercise hard.
I had to eat healthy food in ordinary to make a good conditioned body.
As I am a foodie, I coundn't controll = couldn't control my appetite about sensational favors = flavors and foods.
What is = was holding me back was an appetite and lazy charater.
That's why I messud = messed my body up, so I always gived = gave up tight clothes.
"Swtich on a diet (스위치온 다이어트)" is a hot issue in Korea, that = Korea. It has a goal to increase muscles and decrease fats in the body.
It is 4 weeks = a 4-week plan and made by a doctor specializing in the tratment of obesity.
I tried to this diet 3 weeks ago, I competely failed because of a restriction on food.

What I wanted to say in terms of my disease is "endometriosis". = "endometriosis."
I forgot to say in class.
Thank you for reading. See you soon :-D

OR

I wanted to achieve a beautiful body reminiscent of my past when I was healthy and thin. Back then, I had less muscle since I didn't exercise rigorously. To improve my physique, I knew I needed to focus on eating healthy foods. However, as a foodie, I often struggle to control my appetite for delicious flavors and meals.

My main obstacles have been my appetite and a tendency to be lazy. As a result, I neglected my body, which made it difficult for me to wear tighter clothing. 

Recently, I came across "Switch on a diet (스위치온 다이어트)," a popular diet plan in Korea designed to build muscle and reduce body fat. It consists of a four-week program created by a doctor specializing in obesity treatment. I attempted this diet three weeks ago, but unfortunately, I failed due to the restrictions on food.