Why do people work hard to achieve a particular goal? They may not enjoy all the hard work they put in but they will enjoy the fruits of their labour.
Similarly if you know what is waiting for you in the next life then the temporarily struggle and pain we undergo in this life will certainly be wothwhile at the end
What are a few years on earth compared to eternity in paradise, bare in mind that this life is short and it will pass in a blink of an eye:
Allah extends provision for whom He wills and restricts [it]. And they
rejoice in the worldly life, while the worldly life is not, compared
to the Hereafter, except [brief] enjoyment. [Quran 13:26]
Bare in mind that any pain experienced in this life is a means of expiating sin:
It was narrated in al-Saheehayn that the Prophet (peace and blessings
of Allaah be upon him) said: “No tiredness, exhaustion, worry, grief,
distress or harm befalls a believer in this world, not even a thorn
that pricks him, but Allaah expiates some of his sins thereby.”
(Narrated by al-Bukhaari, 5210; Muslim, 4670)
So rest assured that any struggle faced will surely be generously rewarded:
If you were shown paradise and the road to it, paradise being the most beautiful place you could ever be and the road being rocky, painful and depressing but it is short would you not travel on that road to reach paradise?
The Prophet (sal Allahu alaihi wa sallam) said, “When Allah created
Paradise and Hell, He sent Jibreel to Paradise and said, ‘Look at it
and at what I have prepared for its people therein.’ So he went and
looked at it and at what Allah had prepared for its people therein.
Then he went back to Him and said, ‘By Your Glory, no one will hear of
it but he will enter it.’ Then He commanded that it should be
surrounded with difficult things. Then He said, ‘Go back and look at
what I have prepared for its people therein.’ He went back and saw
that it was surrounded with difficult things. He came back and said,
‘By Your Glory, I am afraid that no one will enter it.’ Allah said,
‘Go and look at Hell and see what I have prepared for its people
therein.’ [He saw it] with parts of it consuming other parts. He came
back and said, ‘By Your Glory, no one who hears of it will enter it.’
So Allah commanded that it should be surrounded with desires. Then he
said, ‘Go back to it.’ So he went back, then he said, ‘By Your Glory,
I am afraid that no one will be saved from it and that all will enter
it.’” [Sunan al-Tirmidhi (2560)]
I understand your point of view as it was always something I wondered about and to summaraise my conclusion in two points:
- AFAIK it is not sinful not and not obligatory to have an offspring.
- By not having children you might denying them the opportunity to gain a place in paradise
