General terms:
* Self-disciplined: This implies a strong control over your own actions and behavior, often for the purpose of achieving a goal.
* Rigorous: This emphasizes the intensity and severity of your self-imposed standards.
* Uncompromising: This suggests that you don't make exceptions or bend your rules easily.
* Demanding: This highlights the high expectations you have of yourself.
* Self-critical: This focuses on your tendency to evaluate yourself harshly.
More specific terms:
* Perfectionist: This describes someone who strives for flawlessness and is often dissatisfied with their work.
* Ascetic: This refers to someone who practices self-denial and austerity.
* Puritanical: This implies a strict moral code and a rejection of indulgence.
Phrases:
* Holding yourself to high standards: This emphasizes the conscious effort to meet a certain level of excellence.
* Having a strong work ethic: This highlights your dedication to work and achieving your goals.
* Being your own worst critic: This describes a tendency to be overly critical of your own performance and shortcomings.
The best word or phrase to use depends on the specific context and the specific aspects of being strict with yourself you want to emphasize.