My iPhone is draining battery very quickly all of a sudden?

Obviously iPhone batteries already suck but mine is draining way quicker than usual. When I get up in the morning it's at 100%. I'll just scroll through Instagram, check snapchat, little things like that and before I know I've already lost 30%. I get up at 7 and right now it's 12 and my battery is on 39%. I haven't been using that much to account for all that battery loss. I've looked up all the different things you should disable to help your battery and I've done every single one of them & that hasn't helped. Does anyone know why this is happening? My phone isn't old by the way. It's a 6 and I got it less than a year ago.

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