Is the OP wearing them round the right way i.e. not back to front??????
Lidl are not exactly a premium or quality brand more like cheap and cheerful so I can't imagine much engineering/technology/quality materials has gone into producing them. At the very least you need to get some padded shorts from
Decathlon which are good value or spend a little more to buy something like Endura Pro bib tights or shorts. If you really want to break the bank then try Assoss bib tights/shorts which by all accounts are like wearing a nappy.
Re the chaffing sores. What ever you wear or don't wear, you need to keep yourself meticulously clean and use Savlon cream if you are starting to feel sore. You can even apply it if you aren't. Go for a large tube. I have never worn underwear between my cycling shorts and me. I can't think of anything more likely to cause discomfort ………….. but each to their own.