if you could go back, what would you change?

so lately I been thinkin', if i had the possibility to go back to a point in my life but maintain the memories I have now, what would I do differently. not only that, but what time in my life would i go to. 

a lot of this question comes from the god awful existentialism i been getting (its real bad, thank you for asking), but like.. i think id go back to 3rd grade for a bit. just cuz theres a lotta people i wanna yell at. but i also really dont wanna go through all of school again. as much as i dont wanna graduate, i really dont wanna go to school again. i want to be younger again, but i dunno what id do if i was. the naivety that comes with being younger without the responsibility. 

life sucks. i want it to stop but i dont know what id do if it did. school sucks and i want to stay home but i dont know what id do if i did. i got nothing better to do so im just doing the shit i dont like

but to  t r y  and save this from becoming too venty, back to the question. 

i think honestly, i would go back to certain points in my life but only for a day, maybe even just a few hours. change a few things here n there and see what changes. 

or would all this just make the existentialism worse.. 

tldr: if you could go back in time and keep all your memories, what would you change