Hi. The effects of peripheral neuropathy can vary somewhat from person to person, so vague things like feet aching whether under pressure or not doesn't really cast much light on the situation.
I notice that you posted in the type 1 forum, and I can say it seems pretty unlikely that aching feet would be the first sign of type 1 in particular. Peripheral neuropathy occurs after some time of elevated blood sugars, and when type 1 strikes it tends to lead to very elevated sugars very quickly, so you'd have other very dramatic symptoms appear much sooner than aching feet. IE, feeling extremely sick and even passing out.
I'm not saying it can't happen though, or that it may not be sign of another form of diabetes that can tend to creep up on people like type 2 or type 1.5. Going to the doctor can be a pain, but the only way you'll get a definitive answer to your question is to go and get checked out for diabetes.