Mental transition from 15-16 ?

Hi! I'm 15F right now. I hear from a lot of my friends and family members that 13 and 15 are the most hard ages to live through,, they say it's because most people usually start puberty at 13, and 15 is the peak of their puberty.

I've personally been going through a TON ever since i turned fifteen, and i just genuinely want to know if it'll get better from here. It feels hopeless, but i keep getting told that it'll get better at sixteen.

Can anyone here support this? Anyone that may've went through rough times during their fifteenth aswell, and found themselves getting better later on? Specifically 15-16, too.

Thanks a lot in advance,