1) You follow "professional" traders on twitter. The truth is many on twitter are complete phonies and have built a fake trading persona to end up selling you something in the end. More on this can be found on my guide on how to identify fraud traders.
2) You look at inspirational quotes or quotes given by "famous" traders as part of your trading regimen. This is non-sense, this won't help you.
3) You assume psychology is a major part of trading, much more than an actual system. As such, you constantly remind yourself that you lost money in your last trade because of psychological mistakes and thus you refer to #2 on the list to regain focus (stupid trading quotes). If psychology was such a big part the simple solution would be to write programs that would trade for you (this isn't a money maker). The truth is, many "professional" traders instill that psychology is big so that they can sell you their products for improving your "weak" psychology. Just to be clear I am sure most of you lack discipline, but even with discipline you still would lose money.