If you answered 'yes', then we have a strategy to turn things around to give you more confidence. If you said 'no', just keep going with the steps. They'll add to your confidence, too.
First, nervousness is a fairly common response when positive feedback has been limited. Seriously, how many of us get enough positive feedback?
Without it, we become conditioned for a bad outcome. So don't feel there's something wrong with you. It's nothing that a willingness to be honest and a little confidence can't overcome.
When the boss calls you aside, there are a couple of ways to change that first negative reaction.
*Do you really know what the boss wants to talk to you about?
*Unless you have special mind-reading powers, don't assume you do.
It could be good. It could be a complement about the work you're doing.
It could be asking if things are going okay and if you need any more help.
It could be a minor correction. After all, training is part of their job, as is making sure everyone is working well together to make the company stronger and your paycheck bigger. Correction isn't a bad thing. Attitude about getting corrected is a bad thing.
Can you agree to stop assuming, even if something happened that you think is going to get you in trouble?