I don't know what's wrong with me

Maybe I'm just sad and I've always hated talking about my emotions but lately I just feel like I'm living in this grey world. I'm 17 and I feel like I should go to therapy at least to talk to someone idk. I've just heard that going to therapy can give you problems you didn't have in the first place. And honestly I don't want to be told I have something wrong with me. I also don't want to tell my mom because she'll just think I'm being dramatic. And even if she does let me go and pay for it I just can't help but feel judged. Should I wait until I'm 18 so I don't need her consent? And by all means she's a great mom I just don't want her to know