betterwithcats.net
Cats go through a period of socialization and the first 9 weeks of their life are the most critical in their social development. If your kitten wasn’t properly handled by humans or had little contact with people then they might have developed fear.
While cats might be renowned hunters, they’re also prey. If you just brought your cat home, then they might see you as a threat that triggers their prey instinct.
If you find your kitty running away from you, and show signs of aggression or constant fear, there’s a chance that they had a traumatic past. The effect of abuse and neglect can have both short and long-term psychological and emotional effects.
Just like with people that can be characterized as introverts, extroverts, or both, cats are no different in this aspect. So, perhaps your cat just wants to have some space.
Next time you approach your kitty notice your movements and the sounds you make. Cats are quite sensitive to sound.
A cat in heat can be less friendly since her mind isn’t focused on you, but on her instinctive need to procreate.