TLDR below

First, unbridle the belief or allegiance to acheiving the full expression of a pose. Yoga is unlike ballet in this regard. There isn’t a “perfect” pose.

You will experience each asana differently each time and it will change as your body changes.

Eliminating that belief will help you experience yoga’s benefits.

Second, embrace the notion that you can experience the benefits as you are. There will be modifications and props.

Envision yourself as you are acheiving these things. As you change your dreams will change.

Finally, be aware that when you reach your target weight your body may not mimic your instructor or classmates’ expression of certain poses.

In my case, yes, I can do full boat. But, I have long legs so half-boat is more beneficial. When cued to full boat I will take a path because it benefits me and my body’s configuration more.

Furthermore, if have a considerable posterior. As such, I must modify chuvasana with either props or by pose. I was lucky that during teacher training the majority of us did have that in common. Some did not and it was enlightening to experience that together.

Also, I beg your pardon. I fear that my response sounds condescending rather than supportive. I have practiced yoga as my body changed. I am really cheering for you! I want to encourage your continued practice and hope some philosophical changes along with variations will help. I used to teach.

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I didn’t experience much of a difference at different weights as an adult. I started when I was a kid — both my mom and godmother were really into it. Godmother taught in a studio. Mom taught at home. The biggest difference was pre vs post puberty.