First part time job advice?

So I'm 16, and today I got my first part time job!
It's at a vet hospital (the same place i have been doing my high school coop program with for the past 5 months) and i will be doing the same things as i was while doing my coop + the new tasks of working back in the boarding (feeding animals, giving medications etc)
i'm VERY nervous.
i start training on tuesday (just shadowing the head boarding staff, and learning what she does every morning, since that will be my new job)
i'm afraid to mess up. i take criticism even if constructive, very harshly.

advice/tips?
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congratulations :-) Being nervous is normal and good! If you weren't nervous, you would be in a bad spot! Just remember, training is training- EVERYONE has to be trained to do just about anything or everything. Remember learning how to drive a car?? You were scared and nervous, but once you get the hang of it, you are a pro :-) You made mistakes, but you learned from them and moved on...right?

Don't be afraid to mess up- most likely you WILL make mistakes, but my advice is to not lie about making a mistake- use it as a correction tool and MOVE ON! Every mistake you will make most likely has already been made by 3 other people. Do not be afraid to ask questions...you might feel like you are a bother, but the people you are working for will be impressed with all the questions you ask because it means you want to do the job right.

Every new job I had is a new experience- more advice is to NEVER EVER talk about how much money you make to others, don't gossip, turn your phone off or on vibrate, arrive 10-15mins early, and ALWAYS eat your lunch/dinner! Being nervous sucks, but it's good you are nervous :-)

I hope everything goes well!!!! Stay positive and true to yourself :-) Constructive criticism is a tool to make you better- please don't take it harshly as a personal attack. Nobody is perfect so correction is needed.
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if you mess up don't worry about it, everyone makes mistakes. only worry if you kill an animal (which you obviously wont). just have fun. since youve been doing this for a while, then you should get the hang of the new things pretty quickly. don't worry because once you start you'll wonder why you were so worried. good luck!