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Please check to see if I used the present perfect correctly here:

It's hard to say that we've been put on this earth for a sole reason, because that's like implying, our lives had been preplanned even before it started.

Or

It's hard to say that we were put on this earth for a sole reason, because that's like implying, our lives had been preplanned even before it started.

Should I stick to one tense? Can I mix tenses like present perfect and past perfect in one sentence? Thank you!
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PreciousJones... see if I used the present perfect correctly here:

It's hard to say that we've been put on this earth for a sole reason ...
Correct.
PreciousJonesCan I mix tenses
Yes, you can.
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By the way, the commas should be removed, and it's "lives ... before they started".

CJ
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CalifJimBy the way, the commas should be removed…
Normally I would agree with you, but without the comma, any reader could momentarily think that because describes …we've been put on this earth for a sole reason…

What are we to do with such constructions?
Aspara Gus ... without the comma, any reader could momentarily think ...
Ah! Right. It's probably better to leave in the comma before because in that case. Emotion: smile

CJ
Do you think that for or as might be a better choice? Those—when used to describe a reason—are usually used with a comma, anyway, no?
Students: Are you brave enough to let our tutors analyse your pronunciation?
Aspara GusDo you think that for or as are better choices?
No. To my ear because is fine in the given context. for seems too literary.

CJ