Assalamu Alaikum.

Im currently 19 and for about 1 year ago I started to offer salat. However when I look back I have so many salat that I have missed, what shall I do?

Can someone tell me how many years of salat I have missed? Is there anyway to ask Allah to forgive me, and ask him to overlook my prayers. Do I have to offer salah for all those years I have missed? And if I die am I going to be punsihed for those salat I have missed?

Jazakallah.