Something seems wrong with your description about how people interact at your workplace. This forum, Linux.org may not be the best place to give you workplace advice, because only you understand your workplace situation.
I do not know what skills the boss expected you to have when you started the job. You should be able to ask for help at any workplace when you need it. The trick is getting the most out of the help that you receive and not needing help too often.
... and also not needing help for tasks that you are expected to know. Is that the truth here? Are you in a job where they expected you to know more than you do?
It may help for you to work on learning and mastering Linux administration skills in your personal time to help you feel comfortable when you are under pressure to accomplish similar tasks at work. Setup your own network and servers at home. Try out the configurations that you are asked to perform at work. If you don't have or can't borrow the equipment you need, then maybe you can set up a virtual network and a few virtual machines to run all of it in your personal computer. The virtual machines do not have to run fast or do much as long as they help you learn skills like "how to configure a two-node HA cluster" and other system administration tasks.
Consider installing VirtualBox or other virtualization software on your personal computer. Create some Linux virtual machines to run on it.
Example:
Earlier this year I started a project to try out several different Linux remote desktop solutions. (That project is still in progress, but currently on hold.) Before trying remote desktops on a real server on the internet, I tested configurations in virtual machines in my personal computer first. They were much easier to configure and test on virtual machines before doing the same with a remote server over the internet. It was easy to take a "snapshot" of the virtual server, try a configuration setting or different software, and then revert back to the snapshot if it didn't work.