All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
First of all, we ask Allaah to facilitate your affairs and make for you a way out from your difficulty and sorrow.
You should know that this life is a test, and a Muslim should be patient when he is tried as there is much good in patience. For more benefit on the excellence of patience, please refer to Fatwa 83577.
Also, it is good for a Muslim to please his parents in what is permissible, because one is not permitted to obey any one in matters that entail disobeying The Creator.
You should appreciate your parents isolating you from other people, as the parents are always affectionate with their children and endeavour to achieve what benefits them, especially in a corrupt environment and when the child is at the age when it is feared that he/she may get affected by others.
It is something good to fear angering your parents, but you should not exaggerate in this and make it overwhelm your thinking, as this may lead to some psychological effects.
Lacking self confidence is something that may be treated by strengthening one's faith in Allaah, and sincerely turning to Him and supplicating Him. For instance you may supplicate with the following Prophetic supplication: "Allaahumma rahmataka arjo fala takilni ila nafsi tarfata 'ayn, wa aslih li sha'ni kullahu, la ilaaha illa ant."
"O Allaah, it is Your Mercy that I hope for, so do not leave me in charge of my affairs even for a blink of an eye and rectify for me all of my affairs. None has the right to be worshipped except You." [Ahmad and Abu Daawood]
This may also be treated by seeking the Help of Allaah and having full trust in Him.
We also advise you to befriend pious women and it is permissible to seek their help in finding a pious husband for you. Getting married may be a solution to many of the problems that you are experiencing.
As regards your brother, you should be patient with him and continue to advise him and remind him about the Punishment of Allaah. You should also supplicate Allaah to turn him into a righteous person; this should especially be done by your parents as the supplication of parents to their child is answered. For more benefit, please refer to Fataawa 87856 and 84800.
With regard to the work of your father in selling intoxicants, there is no doubt that this is forbidden, so he should be advised to stop this job, and he should be reminded that the person who sells intoxicants is cursed. For more benefit, please refer to Fatwa 90289.
Therefore, you are not permitted to eat from his income unless you are obliged to, in which case you may eat according to the necessity. However, if his money is mixed from lawful and unlawful income, then you are permitted to eat from his money, though it is disliked.
For more benefit, please refer to Fatwa 90278.
Allaah Knows best.