Usually for me it is the other way around. People do not trust me because they don't think I know what I am doing because I haven't gone to school (yet) like Zoodiver has. I am only a senior in highschool but have been working with our opossum for two years, our porcupine for three, and everything else since I started. I am the youngest Docent/Naturalist (I'm a volunteer and on the payroll, it's nice) but I do a lot of the handling trainings with the new people. I hate when a new person from another department sees me for the first time working with an animal they can't use and they yell at me. haha
The first time I worked when a new keeper was working, she told me that our opossum had bitten someone before. I politely said "I know" but she said that I would not be allowed to use her. I politely responded "Look, (at my hand) and if you would like, I will lift up my shirt and show you where she got me there" Sometimes, I don't think that people want to listen to a "kid" like me, because they have a degree and are new, but I have been working at the zoo for 4 years!
Another time, I had to give a talk about our porcupine while the seasonal animal keeper showed her to the public. Let's just say the porcupine wanted nothing to do with the keeper or her treats, but ran down the wall she was being displayed on and tried to climb onto me. IMO, porcupines are awesome and very intelligent. Harriet even knows what pocket I keep her peanuts in, so one time she put her hand in and got herself one instead of waiting for me to have her target for it.