have you done an undergrad thesis?

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I am having my thesis these year, and i am having problems because if i haven't tried something yet i don't have confidence to put my own ideas because i'm not sure if i'm correct. well i already have proposed it to my teachers and have been accepted and passed. now i'm going to do the observations. my thesis is about identifying bird species in a specific area. i just don't have the confidence and i just think i can't pull this through.. what should i do?