How to stop lowing/belittling myself

Hey everyone im wondering if this is normal or kinda abnormal to have this feeling. Im 22f, not in US, about to graduate very soon. I grew up and have my middle and high school years in a place where is very difficult to enter a good college. Due to the pandemic times and breakup with a toxic bf, my score dropped badly and ended up going to a very very normal(or a nameless local school) for my degree. It's a shame when people ask me which college i go for and if capable i would just say the city im in instead of the name of my college. Though, compared with my college classmates im always in the front, i just felt like all the awards are something i supposed to have. Achieved something, it's just okay. Didnt make it, i suck so much. Insecurity and shame of my college bothered me years. If i see someone looks nice or dresses pretty i would supoose he or she must have good education and live well. My friend sometimes told me im good/brave...enough, but i just cant stop belittling myself(fvck my shit ego). Maybe if i went to a college with a more decent name, i wont be like this so much. I just regret the choice i made four years ago. And pls dont blame on me so much, the place im in advocates excellent educational background so so much. Im an ordinary person, i know i should stop comparing myself with others but i just cant. I dont know what to do to stop. When truly entering workplace later will my insecurity be relieved a little? Or even get worse? I feel really helpless and truly need some help/kind advice. Thank you so much.