What things do you unfortunately know from experience?

Things are not always gonna go the way you planned it in your head. You might think that by 25, you'll have everything in order. But thats not true. I thought by this age (I'm 24) I would have everything going right in my life, and things will be perfect. I went through a lot in my life. I was homeless for 2 years. At 12 years old, I never knew that would ever happen for me. I never thought any of these hardships will take place for me in life. I learned from experience that things don't always go how you plan them in your head. Anything can happen, anything can go wrong. Life is unpredictable.

1. You teach people how to treat you. 

2. Don't ignore that lump. 

3. Sh1t happens. 

I learned that my balance has deteriorated a bit with age.  And that falling several metres from a tree to the ground HURTS.  And that I was very lucky because a little bit harder and I would have become a paraplegic.  But luckily I will gradually repair.  Unfortunate enough for you?