How bad would it be for my future and career if I got fired from my first job?

I’m 26 and currently 4 months into my first real job, please don’t judge… I know I made many mistakes with my life but that’s why I’m trying to set it on a better path and I have plans to go back to college. So the thing is, I’m working hard but somehow the place I’m working at expects a lot even though we are dangerously understaffed. My biggest fear right now would be to get fired from my first job at my age and after just a few months, it was hard enough to land a job in my conditions so I don’t have a choice to be picky… I’m thinking if I get fired under these circumstances it would be hard for me to get another job again. Am I right to be that scared of termination? Could it set me back even further?
How bad would it be for my future and career if I got fired from my first job?
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