If the creator of Bitcoin Satashi Nakamato created it as an anonymous currency, why does everyone say that it is not anonymous?
Bitcoin is not anonymous, but decentralized? YES, Bitcoin was never built to have such feature, you can only see anonymous features in privacy coins like Monero, Sero project, Zcash, Komodo, Verge etc
If you really want to go anonymous using Bitcoin then I suggest you do some research on Bitcoin Mixer