Okay, so i can't understand one thing, that is when angel jibril came down on cave hira the first time, why was the prophet [PBHU]so shocked, didn't he have his breast open and heart taken out already when he was small ? why did no one pay attention to such stories before he became a prophet ? makes me wonder if hadiths are authentic.
The Prophet [PBUH] fainted according to the Hadeeth of the breast opening: https://sunnah.com/muslim:162c
So he didn't tell anyone about Jibreel in his childhood since he had no idea what happened at that time!
Jibreel indeed must have told the Prophet about the needle marks in his chest after his prophethood, not before it, Muhammad didn't even know Jibreel before he reaches 40 years old, in the same way Moses [AS] never spoke with Allah before becoming a Prophet at 40 years old:
إِنِّىٓ أَنَا۠ رَبُّكَ فَٱخْلَعْ نَعْلَيْكَ ۖ إِنَّكَ بِٱلْوَادِ ٱلْمُقَدَّسِ طُوًى
Indeed, I am your Lord, so remove your sandals. Indeed, you are in the blessed valley of Ṭuwā.
If you still doubt the meeting between the Prophet and Jibreel, then remember that not only the Qur'an speaks about them in Surat Al-Najm [chapter 53], but even the Bible mentions a prophecy about it:
Isaiah 29:12 And the book is delivered to him that is not learned, saying, Read this, I pray thee: and he saith, I am not learned.
ما أنا بقارئ