You aren't alone. I'm so used to how I look now, I'm worried I won't like what I see. Especially with loose skin and possible hair loss. But, at the end of the day, my desire to add years to my life outweighs my concern in that way. It's not shallow imo. How we look changes the way a lot of the world reacts to us, which feeds our own insecurities or appreciations.
I'm actually nervous about how people may treat me differently. I've heard sometimes there can be jealousy, or previous friendships fall apart because you are no longer their "fat friend". Which, I guess in hindsight, is better to know then to not know. I'm sure I'll still be the same dorky me, but lighter. Hopefully most of my friends and family will be supportive.
I'm excited for you and your journey. I'm right there with you.