First - take a deep breath.
NEVER lie, if you don't know how to do something - admit it - then ask for assistance or information. I've been doing this for 20+ years and I still don't know even half of everything there is to know.
There is NO shame in not knowing something. There is great shame in the bad consequences that can occur if you screw up while 'faking' it. Yes, you can fake some things, like smiling when you feel like crying, but not when someone's safety and well being is at stake. Ask questions, clairify, ask for help or advice, google it for crying out loud - just don't fly blind. That said, if you do screw up, take responsibility.
There is NO shame in making mistakes either. The last 'perfect' person, according to popular belief, was crucified 2,000 years ago. So own up, make amends if possible, apologize - and mean it, and make sure you learn from it, then do everything you can to not repeat the same mistake again.
You're human, it isn't IF you'll make a mistake, it's WHEN. And don't ever be part of the nasty 'dogpile' that seems to happen when someone else makes a mistake. It could be you one day alone with everyone pointing fingers at you like they've never screwed up. Kindness and empathy go a LONG way no matter what situation you're in.
Do the right thing, it can sometimes be hard at the time, but not doing the right thing can lead to many sleepless nights and erosion of your self-respect.
Find your niche. The place that makes you happy. Money isn't everything. It pays the bills, but if you dread going to work everyday you may as well be poor. My current job pays less than my first nursing job 23 years ago. And I LOVE it. It's ugly and heartbreaking at times, but I have job satisfaction for the first time in my working life. It took me 18 years of less than satisfying nursing jobs, but I found it.
Grow a thick skin. Nothing anyone else says, does, or thinks is about you. It's about them and where they're coming from at any particular time.
Don't be THAT person. The whining, complaining, helpless 'victim' of everyone and everything. You are not 'owed' anything in life beyond common courtesy. If 'everyone hates' you, there may be a reason.
I agree with the poster who said to treat others as you'd like to be treated. And be kind. Especially to yourself. Good luck!