Newbie question

For the past six months I’ve learned how to play on the one guitar I have, Yamaha FG700MS. Now, no matter how relaxed and ergonomic I’m trying to be, my right shoulder and arm gets tense and eventually numb, because it rests on the edge of the body (like it should). Lately I’ve figured that is this dreadnought body just too thick for me? I’m a normal size and pretty tall adult male, so it should be ok. I’ve tried to change to classical pose, but it’s even more weird, would rather keep the normal style.

Should I just switch to a different, smaller make? What’d you suggest? Electro acoustic also welcome. Or how an earth make it work with this one? I’ve tried sitting as upright as possible, so the arm doesn’t “eat into” the edge, but it still gets numb (on the little finger side of my hand). I’ve tried strap and without strap.

Best,