Insecurities of a designer

Designing has endless options. All of us strive to be creative and original in our designs, but sometimes we fall short. One of the most difficult things about being a design student is the constant feeling of floating about in a bubble of insecurity about how well I'm doing. Our professors are all active in the field, and yet not all of them offer up feedback in a concrete way. I glance around at what others are doing and often find that my work doesn't even compare to what they are doing. I'm told not to compare. How do I not do that? I'm obviously looking around because I want to see what kind of ideas others are coming up with. For some reason I'm not feeling good about my work. Feedback from people not in the field doesn't feel relevant. Unless you're spending equal or more hours creating something from nothing, your opinions of my work don't really mean much (although the positivity is much appreciated). Maybe I just need to find a muse, some inspiration for what I think it means to be great.