What should I do about the estrangement from my paternal uncles, given that I am 14 years old and do not have a strong personality?

The recompense for maintaining kinship ties depends on one's ability and custom. This may involve visiting, or giving money to those in need, or speaking kindly and inquiring about their well-being, or corresponding and sending messengers, or communicating via calls and modern means of communication. A person is not obligated to do more than they are capable of or what is not customary.