Why does my singing voice sound strange when I record it?

So when I sing, I feel like my voice is pretty strong and powerful and loud but then when I record it, it's the opposite. It sounds weak and low. I record my singing from iPad and iPhone by making video. I want to know if my voice is just weak like that or is it because of the devices I'm using to record myself? Because I heard people say that when you hear yourself sing, it'll sound different to the others or when you record it. But I'm not sure my voice would be that bad and weak.

The recording quality of iPhone is bad, I know this very well as an iPhone user.

Your voice doesn't sound to you as it sounds to others. The one you heard on the recording is probably closer to reality. If you want to improve your singing, go for offline lessons with a fully trained teacher, it's the only way to learn all the singing techniques safely, without damaging your voice.

How your voice sounds when you record it is nearer to what other people hear than what you hear when you are singing.So, if your voice sounds bad and weak on a recording that is going to be very close to what it sounds like to everyone else. To improve you need to have offline singing lessons.