My kitten is biting us when we pet him.

I have a one and a half month old kitten. He is well fed and taken care of. We make sure that we don't let him play with our hands but whenever we reach to pet or caress him. He tends to jump and bite us. I will get him vaccinated once the lockdown at my place is lifted. Even though his fangs wont do any harm now it might lead to problems in the near future. My relatives have been asking me to get rid of it because they fear that he might cause rabies but I don't want to abandon him. Is there any way that I am able to train him better and get rid of his habbit of biting? And i also want to know what is the reason of him biting us ... Is it fear or something else because I have friends who also have cats but they haven't experienced something like this.