I am a man and want to get married due to fear of sin. My parents won't allow it because I am in college. Should I marry now without telling them and then tell them later about the girl without saying I was already married to her?
Man does not need his parents permission for marriage, however, he needs to avoid hurting them or making them feel disrespected.
If you need to get married to save yourself from falling in sinful acts, you should go ahead and get married with a suitable believer female.
Wassalam.