I want to write something like "Follow your dream! Make sure it is un-influenced by the society". Is there a better word?
Here the idea is to convey that dreams should not be seeded into someone by the society.
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The exact word you are looking for is unswayed ("not moved or affected : not influenced unswayed by personal considerations", Merriam Webster).
Follow your dream! Make sure it is unswayed by society.
Note that I removed the article before society, as this is an uncountable, abstract word.
Instead of the second sentence saying where dreams should NOT originate, maybe try an adjective to emphasise where they come from e.g.
"Follow your own dreams!".
In a similar vein there are plenty of synonyms for 'own': personal, individual, particular, private, personalized, idiosyncratic, characteristic, unique; especial
Not a single word answer but this may convey the meaning you are after:
"Follow your dream regardless of society!".
Immune — ODO
adj. 2.1 (predicative) not affected or influenced by something.
"no one is immune to his immense charm"
With that quiet but unyielding determination, he has put his newspaper at the forefront of the battle to keep an independent and critical press alive.
Assuming you're implying society influences would be a negative factor:
"Follow your dream! Make sure it is uninhibited by the society"