Go back to your first principles, why are you doing what you're doubting? Is the motive pure and genuine? Are you aligned with your beliefs and heading towards goals which you have set? Is your knowledge base sufficient? If not, take a step back, re-evaluate, realign and get back at it...

Without any context that is the broadest stroke of advice I can give. 🤷🏻‍♂️ understand that imposter syndrome is a thing also and self doubt is a sign of a healthy mind. Work with it, not against it 💪🏼