why my music that i buy until now, from 2014, is not on my new iphone8?

Hi there, bogdogdan70!
Thanks for reaching out to the Apple Support Communities! It sounds like you are having an issue with music being missing from your iPhone that you purchased and I am happy to help out. I recommend you take a look at this article to Get help with iCloud Music Library. This article will give you the best steps to follow for missing music along with the steps to take if you continue to be unable to find your purchased music.
Also, check out this article to be able to Redownload apps, music, movies, TV shows, and books from the iTunes Store, iBooks Store, and App Store to download previously purchased music to your iPhone.
Cheers!