Continue learning. There's nothing you can do right now to stop seniors from spotting problems in your code. That's completely normal. In the meantime, you can

Continue learning. There's nothing you can do right now to stop seniors from spotting problems in your code. That's completely normal. In the meantime, you can change your attitude. It's not supposed to make you feel frustrated or like a fraud. It's supposed to be both a quality gate and a learning experience. Any ego on either side of a code review makes it a worse experience.