Does this mean I'm jealous/envious or just insecure because of this?

Well I'm a gospel singer (well, trying to be) and I just feel inadequate sometimes. Like when I hear other gospel singers who can do all of those crazy rifts and runs, it just makes me feel like I'm not good enough. I'm shy sometimes about singing in front of people (I still do it though) because I get scared of what they may think.