Is my iPhone 4 going to stop working soon?

So since I can't get ios8 on my iPhone 4 does that mean my apps will stop running soon?

No. With care it can run for years. Still have a 3gs I use as iPod with older version apps on it. Works fine. Most apps in Appstore still run on iOS5 or 6 as minimum and then higher. You're fine. Best luck.