What will happen to my Crossbite if left?!

Hi, I have had a real annoyance when i look at my teeth since the age of 13 and am 16 now. My crossbite was first brought to my attention when i was 12 when a dentist pointed out that my top teeth and bottom teeth midline did not line up. it has annoyed me ever since and its apparently not bad enough to be on the NHS so my parents refuse to pay the 1500 pounds it would cost for braces. I currently do not experience many pains but i can notice my jaw when closed is slightly thrown of which again adds to a personal annoyance. The best way to describe my situation is that my teeth are very straight without any braces worn before and my bottom right two teeth being canine and molar behind it re outside my top set of teeth . Im wondering if i leave this will the bottom set push further outside the top set, or will the pain of my jaw just increase? also I was wondering if there are any other cheaper ways of fixing this without touching surgery

many thanks Thomas