So let’s get this straight, at the end of GOTG2 Peter has, in the space of (at most) a few days:

• met his father and put a lot of hope in him only to have him turn out to be evil
• learned his father killed his mother, the person he loved most in the world
• been physically tortured and mind-controlled by his father
• learned he once had thousands upon thousands of half-siblings, all of whom are dead
• seen his father crush his mother’s last gift to him just to spite him
• seen all his friends nearly die
• very possibly seen, via being hooked into Ego’s planet, millions of people across the galaxy being killed via Ego’s Expansion
• almost died (and was accepting of it)
• watched his adopted father, a person he loved despite their strange relationship, die painfully in the void of space to save him

how. is the poor man still walking around