What are your thoughts and how can you explain the part of Jesus's life that wasn't in the bible?
The strongest argument that Jesus wasn't married that isn't simply the straightforward argument from silence (i.e., nobody said he was in any of our extant texts) comes from Paul's 1st letter to the Corinthians. He asks rhetorically (1 Cor. 9:5) whether he and the other Christians had the right to "lead around" (περιάγειn/
periagein) a wife, and defends the affirmative answer by noting that the brothers of Jesus and Peter do. Were Jesus married, all he'd have to do is say "don't we have the right to do what the Lord did?". Also, among the various preachers/prophets, Jewish movements, & Jewish sects of Jesus' day we find the closest to be those who were unmarried (like John the Baptist) or contained many unmarried men (like the Essenes).
As for why we don't information on most of what happened before Jesus' ministry, it's because nobody cared. He had no followers, he had no crowds, there was no oral tradition circulating, etc. I would be very surprised if the entire birth narrative wasn't made up solely or mostly to explain why Jesus of Nazareth was born where the messiah was supposed to be and yet called Jesus of Nazareth. In other words, we're missing any historical information about his birth and earliest years as well as the so-called "missing period".