New here - Question on managing drawdowns psychologically

Hey everyone, been lurking a bit, finally decided to post. Still pretty green, mostly trading $SPX options. I've been doing well enough to stay afloat, but those inevitable drawdowns, even when they're within my planned risk, just wreck my focus. I know it's part of the game, but the mental battle to stick to the plan when I'm down 10-15% for the month is brutal. It makes me second-guess every entry. How do more experienced traders keep their head in the game when they hit a string of losers, beyond just 'sticking to the plan'?