Its only an extra 7cms each end from your old skis so they should be alright, you'll get used to them pretty quickly and your growing so i would go for it
i was riding 176 pc's a few years ago at 5'8" and 128ish lbs and i loved them. thought they were great and a perfect size. and i wasn't going to grow more. so i would say go for it dude. and i mounted them at -2.5 back from center if you were wondering about that too.
don't worry about the size jump, a few years back i went from a 158 to a 180, it was actually because i got the 180's for free, but they were so nice in the park and super stable on jumps.