Iphone: sound only works when i plug in headphones?

I can hear people when i talk on the phone, i can hear my alarms, but other then that… I can't hear music i play, or the keyboard clicks or videos unless i plug in my headphones… I've tried blowing in the headphone jack, i tried putting paperclips in it and fidget around. But nothing seems to get the sound back.

There's a switch on the left side.switch it so that re isn't showing.hopefully the problem…