How do I check if I'm using proxy?

I'm curious, how can I verify whether I'm currently using a proxy connection for my internet browsing or cryptocurrency transactions? Is there a simple method I can follow to check this, especially if I'm concerned about my privacy and security online? As a cryptocurrency enthusiast and investor, it's important for me to ensure that my transactions are as secure as possible. Could you please guide me through the steps to identify if I'm utilizing a proxy server, and if so, how to manage or disable it if necessary?