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So, a couple of things here. There are challenges to online learning. A good teacher can physically show you hand and finger placements. A bit more difficult learning online. That said, some issues may be your guitar, and how your hand fits the neck. All instruments are different, and have different sized necks, scales, bodies etc.. Another suggestion is trying to lower your elbow, creating more of an angle so you can create more of an arch. A bit difficult to explain. Also, as I’ve progressed, I have gotten more “arch” when forming chord shapes, and don’t mute as much as I used to. This also helped with the fleshy part of the palm that can mute the high E string sometimes. Others will chime in with words of wisdom.