It took me about two years as a new RN with absolutely NO nursing experience, not even as a CNA, to feel competent and not be walking on eggshells.
There are so many posts like yours. It is unfortunately, just a part of working as a new LVN or RN. It is scary, you hate to feel incompetent, you think you should know everything, you hate to ask questions, etc. You feel bad, sad, incompetent, you lose all your self confidence, you ask "stupid" questions because you don't trust yourself, you feel stupid for asking a stupid questions, "wash, rinse, repeat".
Thousand of new grads feel like you. Just put "first year nurse feeling incompetent" in the Allnurses search box and you will get 100's of hits.
Don't give up, it will get better. I used to go to work thinking, "I hope I make a huge med error and get fired so I won't have to do this job anymore". It actually took some of the pressure off!
Face the worst ........... (you will make a huge error and get fired from your awful job)
Believe the best......... (your a good nurse and you will be fine)
Do the most ....... (don't rush, remember the 5 rights of medication administration)
And leave the rest........ (obsessive worrying doesn't help)