How can one balance their duties towards their family and parents with their right to build their own future and secure their marital life, especially when they feel injustice and imbalance in bearing financial and family burdens?

There is no harm in you being alone, away from your family, as long as it does not involve cutting ties, mistreating them, or neglecting their rights. You are not obliged to obey your parents in joining the family in a way that causes you financial harm.

You must strive to honor your parents and maintain kinship ties, and to appease them in every way you can without harming yourself. Seek Allah's help, and use gentleness, wisdom, and tact in dealing with them.

Be keen on sincerity and seeking Allah's reward for your actions, and be patient; for Allah does not let the reward of those who do good go to waste, as stated in His saying: {Indeed, he who fears Allah and is patient, then verily, Allah does not allow the reward of those who do good to be lost.}