<s>[INST] A recent college graduate in Biology, I have just landed an entry-level position as a biological technician in a local lab. My boss is excited to have me on board, and the work environment seems great. However, as I begin my training, I notice that my supervisor consistently makes critical comments about my work. While the comments are constructive in nature, I find myself constantly trying to please this person and feeling anxious about making mistakes. To top it off, my supervisor also makes occasional jokes about me being a "youngin" and "green" behind the ears. Though the jokes are probably meant to be light-hearted, they make me feel uncomfortable and undermined. What are some strategies I can use to establish a positive and assertive relationship with my supervisor?[/INST]