| Is it because you're always looking at the fingerboard when you play?
If you need to look at the neck often, I find it's helpful to emulate a (modern) classical guitar player's posture in a seated position: instrument at a 45 degree angle, right foot on the floor, back straight, and with the back of the instrument, your knees and your stomach forming a triangular space, so that the face of the instrument's tilted up slightly towards you. This way you can look at dots/lines/the entire instrument without having to hunch or bend your neck.
This could be an instrument problem as much as a technique problem. A lot of instruments with rounded lower body edges slide around on one's thighs when playing seated, and the player tends to compensate by bending his body over the instrument to keep it in place. Similar issues occur with instruments prone to neck-dive. Wearing a strap when sitting can help with this.
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