Please help! Thick hair problems

dude. i’ve been having the hardest time getting shampoo out of my hair. i use around a quarter sized amount. it got very bad very quickly. i cant get any shampoo out now no matter how hard i scrub. my thick hair isnt helping this at all. my hair is layered, so i figured that would make it easier, but it doesnt. i rinsed my hair out for an hour tonight, and it looks the worst it ever has before. like it looks like i got out of the pool and dried my hair. can someone please give me any advice before i go end up like brittney spears and go bald 🙏🏻🙏🏻 it’s all over my head. i’ve used dove and native shampoos. my hair looks like shit. i used to love it but it’s now my biggest insecurity