My iPhone (4) keeps having different problems.What to do?

I got my iPhone last November, and it's been having a lot of difficulties lately…

- Every time I open an app if crashes.
- It won't let me screenshot or save pics.
- Sometime it won't let me get on the internet. The page will turn black. Or it will crash
- It won't let me post on (fb/Insta)
- I can't delete pics
- It won't let my mail upload. Or it will load and say (no sender)
~ I've tried to reset my phone, turn off my phone numerous times, hold the on button & middle button @ same time, delete pics because i have MANY pics. I can't back it up because I have no computer. :/ My iCloud won't back it up, I tried talking to Apple & the customer representative was a little rude, I can't take it to apple I have no car. Update my phone is needed, but it still shouldn't act this bad
* If you have any way to help please let me know NO stupid answers!

If an update is available you should update it and if it doesn't work you maybe need a new phone but i'm pretty sure the update will work

The system is outdated and a marketing ploy for Apple. Upgrade to a new phone.

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