Why isnt my instagram working?

my instagram hasnt been working for a long time. Im not sure if its my device, my profile or something else. Im honestly so frusterated because my phone is a iphone 6s plus and it should work. I am not sure about it bc i had my friend log into my instagram to post a picture for me and it wouldnt work when she went to click the post button even on her phone. My instagram keeps closing out when i click on the app. I have called everyone and i have done almost everything in the world to try to fix it. I restarted my phone, i uninstalled and reinstalled the app. I have done everyytthinngg. Please help me if you know the issue i would really appreciate it.

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