Is it normal to not like other people?
Depends.It depends
It’s normal to find people tiring, prefer your own company, or feel fed up with people sometimes. If you mean you feel contempt for everyone or you’re lonely despite wanting connection, that may be worth unpacking.
Lots of people don’t enjoy socializing much, and you don’t have to like everyone to be a decent person. Sometimes “I don’t like people” is shorthand for needing more space, being disappointed by someone, or being worn out by social demands.
It’s a different thing if the feeling is constant, makes you treat people cruelly, or leaves you isolated when you actually want company. You can keep your boundaries and still stay open to the possibility that some people are worth knowing.