I think I will never...,

[Silverobama]

I think perhaps I will never get married this life because many different reasons. Is it natural to say “I think I will never get married in this life”?

 

[Rover_KE]

Unless you believe in an afterlife, stop at 'married'.

 

[emsr2d2]

I think perhaps I will never get married this life, because for many different reasons. Is it natural to say “I think I will never get married in this life”?

Don't use "because" and "reason" together.

I agree with Rover that "in this life" should be omitted (unless you're talking to someone who you know for certain believes in an afterlife, and indeed in one in which it's possible to get married). I'd also change the opening. The natural BrE version would be:

I don't think I'll ever get married.