Is it possible to buy BTCs without an exchanger?

I don't get it !!!!

So, I am using Binance Brazil to buy BTCs. My goal is not to trade but to have BTCs to be used in the future for something else. For this reason I am buying small amounts every month and transfering to my external hot wallet.

Most of the Brazilian exchangers are charging 0.0004 BTC or 0.0005 BTC to withdraw.

So, if I buy BRL 500 (Brazilian currency) in BTCs I will have 0.00078964 BTCs and to transfer to my hot wallet I will pay 0.0005 that is 63% !!! That is too much !

Is it possible to buy BTCs without an exchanger? Meaning, from my hot wallet, can I buy BTCs directly from someone ?