I'm going to tell my friend I lost weight
Why are you telling your friend that you lost weight?
She will be jealous and that will make me feel better about myself.
It's wrong to make someone feel bad if they are struggling with their weight. You should help your friend to reach her goals if they are similar to yours.
No one complained. At least I look good and I'm happy.
You are allowed to tell your friend about your weight loss. But it's rude to purposely make someone feel jealous when they're unhappy about themselves. It's better to be kind and supportive to your friends.