Can't find my right foundation
Maybe you should try and go to a MAC store and see if they can help to try your right shade? They have tons of shades and undertones! Bigger Sephoras have MUFE counters and someone can help you to find your right shade in MUFE HD Foundation (I got lovely help from them and I found a super right shade!)
Well, what brands have you tried?
Try looking to brands with a larger range for medium/tan options like Loreal's True Match, Urban Decay's Naked Skin, Kat Von D's Lock It, Sue Devitt, and MUFE.
Try to test swatch at least 3 colors along your jawline to get the closest match. If possible, see if you take a look or be in natural sunlight to get the best viewing.