Hi Lilly,
I'm with you, but realize that in this forum are those who think Paul's revelation on the road to Damascus was a hallucination experienced during an epileptic seizure, or from a concussion received when he was thrown from his horse on the way to Damascus. Others have said his conversion came about because of intense guilt he felt from participating in the stoning of Stephen and persecuting Christians. Also, much of what has been traditionally attributed to Paul in the NT has been called into question. Then there are those who question whether Paul even existed at all as a historical person, as has been done with Peter and even Jesus.
Perhaps the most significant statement Paul makes about his teaching is found in Galatians 1:11-12—
I want you to know, brothers, that the gospel I preached is not something that man made up. I did not receive it from any man, nor was I taught it; rather, I received it by revelation from Jesus Christ.
When he said it was not something made up by man, he would be including himself. Whatever his background, however he was influenced by the culture, his claim means he did not formulate the gospel himself, or from the teachings of others. We could suggest that his education, training, and cultural background may have made him better-prepared for going out into the Roman Empire than even the Apostles who had stayed with Jesus around Jerusalem.
While the teachings and emphasis of Paul may seem different than the Gospels, all the writings seek to promote faith in Jesus as the Chosen Messiah and Son of God to whom we must ultimately give account. While Paul relies on the resurrection and work of the Holy Spirit in the church as testimony, the Gospels make use of details in the earthly life of Jesus.