I wanted to buy Tether so I was looking online where to buy it. I tried few websites, but it took waaaay to long to register. I needed to provide my email and pass, then confirm email, set up 2FA, get code on my phone via SMS, leave my personal data, address, upload ID, upload this document, upload that document...
Because the number one problem worldwide is money laundering and terrorist funding which is the government trying to combat these problems, to minimize this issue. All custodial services were strictly implemented KYC/AML to their all customers, to always verify and at the same time identify user's activities. On other hand, this also serves as your security not to steal by others your fund on an exchange by setting up and multi-layer of securities including 2FA.
Alternatively, you can find exchanges that are decentralized systems but the problem was stated above, it could be your fund might freeze by the bank if you will convert to fiat, bank will always ask the source of your money where this comes from.
P2P is the best way for you regarding this matter but always remember to use escrow or a middleman for each transaction.