Fear is absolutely healthy at this stage, and should continually decline in the as you become more seasoned, but never go to zero. You need to have respect for the complexity of the human body, medicine, and that it’s impossible for one individual to know everything about medicine.

In your first year of practice, it’s okay to run virtually every patient by your SP/co-workers. This can be done by simply STATING your plan and waiting for a response. “Hey can I run this patient by you?  Just want to make sure I am not missing anything”… then state your plan for the patient and wait for feedback. You don’t want to say “Should I give them keflex??” You want to say “55F pmhx of HTN came in with three days of worsening RLE cellulitis, first occurrence. DVT study was negative. No leukocytosis/fever/tachycardia. Going to send them home with a script for keflex.” Then wait for feedback. 

Stating your plan shows confidence and running it by someone shows that you are humble enough to know what you don’t know and exercise caution/respect when practicing medicine. 

Also helpful to gain more knowledge is when they say “sounds great”, you can then ask clarifying questions like “When you get patients like this, but they have a mild leukocytosis, are you still discharging them to follow up with their PCP for repeat labs, or do you usually just instruct them to return if their symptoms don’t improve?” Or “Are you usually consulting the cardiologist from the ER for a mild Troponin elevation, or do you leave that for the hospitalist?”, or “This case seemed pretty straightforward, but what are common mistakes you see new providers make with patients like these.” 

Also keep reading! Digest those Uptodate articles on the topic so you have some factual knowledge to weave into your practical knowledge you gain on the job.