You need to speak English, that it's the most common language.
WHICH IS
My parents set up a bussiness by their own when they were younger.
ON their own
There are three people in the motorbike, and they are without helmets. (2 mistakes)
ON the motorbike, they AREN'T WEARING helmets
I think the little girl likes to feel the painting in her hands.
the PAINT
Then I think that we've reached to a decision.
reached a decision
I think it's a great opportunity and it can open you a lot of doors.
can open a lot of doors FOR you
I'm not scared of commiting mistakes anymore.
MAKING mistakes
If you're a person that want to focus, maybe you should study alone.
WANTS
The teacher explained me why the tradition began.
TOLD me / explained TO me
I can get impatient when I'm a lot of time waiting for someone.
when I'm waiting for someone for a long time
I don't really like painting. I don't find it relaxing, in fact I think it's stressing.
STRESSFUL
I remember a time when I did cookies for my family and they were quite good.
MADE cookies
Last year, I've been abroad all year.
I WAS
I think visiting different cultures can give you a lot of knowledge.
visiting countires, learning about cultures (you can't visit cultures)
They are very good with some things, but for another problems, they don't help you.
OTHER problems