compulsion

I am 27 years male from India. I have few questions regarding my marriage; 1. My parents want to marry me to cousin (daughter of my father?s elder sister). They are pressurizing me to say yes to their will and do the engagement. She is a quite beautiful, moderate(low) practicing Muslimah and has little education (12th standard). Therefore I don?t wan to marry her. I really don?t know how to refuse to my parent. So far I have been very much obedient to my parents. I wanna how I can refuse to my parents. Will it be considered as disobedience to my parents? As much I know they cannot force me to marry with a girl of their choice?2. Is it better to marry in relationship (like my cousin) or outside the family? As much I know prophet (PBUH) recommended marrying outside the family and clan? Please tell me the preferred way as per the Sunnah. Allah hafiz