Hey /biz/, I'm looking for some perspective here. 23 male

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Hey /biz/, I'm looking for some perspective here. 23 male here, graduated from a decent uni in STEM, but the only solid career prospect I have is to be a science teacher for high school level or below at a decent school district. My problem is I (at the moment) don't really have the patience or the confidence to see myself standing in front of a classroom all day. I know for a fact that I could bear with it if I absolutely had no other option and really needed the money but at the moment that's not the case, hence why I'm still deciding.

So my question is: when deciding on a career/job, how do you stop yourself from thinking about picturing yourself in that job as you are right now (in my case introvert and insecure about a lot of things) but instead picturing a "better" or just different version of your current self at that job. Does anyone have any stories of how they were able to successfully change who they were in order to be good at a job you didn't think you could do? Is there any merit to "knowing yourself" and sticking to where you know you'll succeed or is it always better to expand yourself even if it would make you miserable for the sake of economic advantages?