Used to do this (and still do on darker days), but therapy really helped me with this. My therapist asked me why I give out compliments. I and everyone I know does it to make the complemented person feel better. Doesn’t matter if it’s true or not. They do it because they care about you.

Hope this helps, otherwise I’m there is also the cogito app which is free and gives goot tasks to work on self esteem and you can look up meta cognitive training, I’m sure there are free resources on the internat for that aswell. Just know you’re not alone <3