ANSWER:

There’s nothing you can do about that except repent sincerely to Allah while showing deep remorse and pray a lot of voluntary prayers, especially night prayers in order to try and compensate.

Do other voluntary good deeds besides never missing the obligatory acts of worship.

I have missed many prayers when i was young (reached puberty) as my parents never told me that i was sinful. Now i pray all my prayers Alhamdulillah. What can i do now about the missed prayers?