Tweaking is frustrating!!!

Anyone else feel like tweaking is getting frustrating? I mean it's like no one sees anything on my tests and I know it's no ones fault but then there will be a test that looks just like mine and people say congrats, I see the line!! It's starting to make me wonder what the heck people are seeing. I mean some are very obvious lines but there are a lot where I see nothing in the tweak and others say they do! But when mine get tweaked I always get a big fat NO! Again, it's no ones fault and no one is a doctor so there is no 100% tweak but I'm just getting frustrated because I don't see what some see and when I see something no one else does! What's the deal!