In a short answer, instead of, “In my perspective,” I wrote, “In y perspective.” Is it too big an error? Should I be worried?
no
Most essays have a typo or two. In some ways, it lends a aura of authenticity. 
Universities do not mind.
Anyone reading that sentence would know what you meant.
Thank you guys, that’s a big relief phew 
@siliconvalleymom @Alexandre @TheresaRuth @doctorgirl