Here are some of the most-upvoted answers:
1.
“At his funeral, my aunt told me that my brother wasn’t really my brother.
When I was 12 and he was 23, he was hit and killed by a drunk driver.

I looked up to him and I loved him so much.”
u/Mynameisinuse
2.
“My mother moved back to her home country when I was nine.

I was always told she could never come back to my country due to visa/immigration issues.
She confirmed last year that this was not the case and she could come back any time.
I realised she chose not to.

u/anothercrazydoglady
3. u/No_Brush_7706
4.
She had it for 25 years, so it was a bit of a project but I did it.
When my mom passed away two years ago I found my grandmother’s will.

That ring was the only thing my grandmother had left for me.
I always wondered why she left me out of her will, because we were so close.”
u/Loreo1964
5.

“Way back in the day, I searched my name in my long-term girlfriends chat log.
u/WNY4LYFE
6.
“Finding out someone died when I thought they were just living a great life.”

u/jordan-lakers9394
7.
“I inherited my wifes late uncles computer.
u/trainwreck42
8.

“I overheard my best friend being asked why they let me hang around them.
Their answer was that it was out of pity.”
u/varthalon
9. u/octoroach
10.

I looked up the symptoms and the first symptom was apparently anxiety.
Let’s just say that was not helpful.”
u/Fart17
11.

“People will treat you better when you have money.”
u/Nicoh071211
“I hope to one day find this out first hand.”
u/slowhand11
12.

“That there are people who genuinely had a happy family.
Sure enough, every time I was around them it was the same.
u/Ristar87
13.

“My sister and I are adopted.
It only went downhill from there.”
u/Chosen_of_Nerevar
14.

I regret finding out because all it did was cause drama and hurt between multiple families.”
u/agent_x_75228
15.
“Finding out the one I loved had had someone else in his bed almost every week.
Just end things and leave, dont cheat for months and months.”
u/Ashamed-Vegetable-89
16. u/livingasaadhi
17.
“That the law protects the wrong people in the worst situations.”
u/unintelligentburrito
18.
“The secret life of rock stars.
Growing up, it was nice just to see them as rock stars.
Social media ruined everything.”
u/jayihdz
19.
“I think I was happier before I found out how the stock market & financial system works.
u/Bigblue12
20. u/rainvirgo
21.
“That some parents do not love their children.
That hurt me.”
u/Keyblades2
22.
“Finding out that my grandpa on my moms side of the family was a selfish, self-centred ass.
I always idolised him as a young kid.
he was a member of the government who travelled the world developing maps out of memory.
u/JohnnyGuitar74
23.
“I learned that I was the product of an affair my father had.”
u/Legitimate-Most6739
24.
Turns out he had five others with at most four different women.”
u/IamAssface
Shout-out tor/AskRedditandu/Jimbobsausagefor having this discussion.
Note: Submissions have been edited for length and/or clarity.