Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.
The woman has the right to choose for herself a husband, but this should be done according to Islamic etiquettes and Islamic legislation, without being in seclusion with him or subjected to any coercion. Please refer to Fatwa: 82471.
If a woman is pleased with a man of good manners and religion, and the latter proposes to marry her, then her guardian should not refuse him, and should not have suspicions about his daughter just because she had chosen a given person for marriage.
Please refer to Fatwa: 83394.
You should know, however, that the consent of the guardian is one of the pillars for concluding the marriage contract.
There are many means to convince the father, among which are:
1) To inform him that this is an Islamic right of the woman.
2) To ask your mother, or maternal or paternal uncle or any other person to whom your father can listen to intercede for you.
3) To be kind to your father and get closer to him.
4) To give him this Fatwa or the Fatawa we referred you to concerning the consent of the woman to marry. She should not be compelled to marry someone she does not like.
Allah knows best.