What's wrong with my iPhone 6?

Yesterday my phone wouldn't hold a charge for very long. I had to charge it at least 5 times so it wouldn't die, and normally I only charge it about twice. I didn't use my phone that much and when I did it wasn't anything that should have used too much power. My phone is updated and I don't have Bluetooth or navigation on, so that isn't draining my power. I also tried to charge my phone a few times last night and whenever I would it would only go as high as 65 percent. I tried different cords and he same thing would happen every time. My phone would also get pretty hot. I plugged my phone in before going to bed and it seemed to be working better, I got up at 3am and saw it was still stuck at 65 percent. I unplugged it and blew into the charge port and plugged it back in, which seemed to help. It charged all the way. Since then I've used my phone a little and it's already down to 20 percent (I stopped charging it a few hours ago). What's wrong with my phone?

Just get an android

Bad battery.