Problems With Recording

Hello everybody. I have had my Samsung Galaxy J3 for a while now. It is one of my favorite phones as it is quick, has great battery life, and good video quality. The problem I have involves recording videos. I have recently started to do vlogging type of videos with it, and have noticed that videos are dark in darker rooms (Even with lights on). When I go outside on a sunny day however, the video quality is amazing with awesome lighting. Is there a way to turn off the phone darkening when it records? I noticed this when I took a picture, and it is much brighter than when it records. I tried the flashlight on it to add light, but that is kind of hard when I have to angle the camera to my face. Any tips on how to make videos brighter, or somehow turn off when it darkens videos for me? Thank you.