Why won’t Gmail allow me to change my profile picture?

Why won’t Gmail allow me to change my profile picture?

I've tried many and multiple times to change my profile picture. all it says is, "Sorry, you can't change this photo for this account." It'll keep saying that over and over again. I hate my profile picture. I just wanted to change it because everyone in my online classes are making fun of me for having this profile pic. I've tried going through "About Me" and it just won't let me. I just want to change it and get out of this terrible bullying. Please, if you know how to do it, please notify me. Thank you.

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Author: LilSketchWolf