Not knowing the signs of puberty and not praying out of ignorance

Recently I found out that growing pubic hair is a sign of puberty. But before I didn't know that and only started praying 5 times a day once I got my period. Will the prayers I missed before be counted since I didn't know they were obligatory on me? And I don't know when I started growing hair. There was a time in march until May when I prayed but stopped cause it was so hard for me because no one in my family prays and they're not religious so I have to hide it. Do I have to make up the prayers that I missed? And am I sinning if I don't? Because I don't know how many prayers I have to make up. Maybe 2 years worth of prayers... maybe 1 year... maybe 6 months... I literally have no idea whatsoever so I'm waiting on my little sister to start growing hair down there so I can estimate how many prayers I have to make up. But I am more hairy than her so it may not be accurate