Is it okay to gaslight myself into academic success?

As the title implies, I find the most success when I gaslight myself into thinking I’m the smartest person and that the material I am learning is easy. However, as a new Christian, I’m not sure if this is a good thing to do. I’ve tried not to do this and my grades suffered tremendously this semester. I know this sounds so stupid to ask, but please let me know your thoughts. Thank you.