Actually, after Paul encountered the bright light and Jesus identified Himself, Paul didn't need Ananias' help to accept Jesus as his Lord. That happened completely and "officially" on that road to Damascus when Jesus said, "I am Jesus whom you are persecuting." Paul "accepted" Jesus at that very instant, and Jesus knew that he had, because He proceeds to give Paul an assignment, as a brand new believer - right there on the road to Damascus. We see that clearly in Acts 26:15-18. Jesus tells Paul that He has appointed him as a minister and a witness, not only to Jews but also Gentiles ... to open their eyes that they may turn from darkness to light ... and from Satan to God ...to receive forgiveness of sins and an inheritance among believers. And Paul is STILL on that road.
Three days later, when Ananias comes to him, he calls Saul "BROTHER SAUL", so Ananias knew that he was already converted.
The Bible doesn't tell us that water baptism "makes our decision to follow Jesus official" The Bible says that baptism is a SIGN of the faith in God that we had before being baptized.
So Ananias helped Paul get a good understanding of his conversion. And make a public confession of it. The outward sign of the inward conversion "baptism".
God seems to think Paul needed some help from Ananias.
Ananias Baptizes Saul
10 Now there was a certain disciple at Damascus named Ananias; and to him the Lord said in a vision, “Ananias.”
And he said, “Here I am, Lord.”
11 So the Lord
said to him, “Arise and go to the street called Straight, and inquire at the house of Judas for
one called Saul of Tarsus, for behold, he is praying. 12 And in a vision he has seen a man named Ananias coming in and putting
his hand on him, so that he might receive his sight.”
13 Then Ananias answered, “Lord, I have heard from many about this man, how much harm he has done to Your saints in Jerusalem. 14 And here he has authority from the chief priests to bind all who call on Your name.”
15 But the Lord said to him, “Go, for he is a chosen vessel of Mine to bear My name before Gentiles, kings, and the children[
b] of Israel. 16 For I will show him how many things he must suffer for My name’s sake.”
17 And Ananias went his way and entered the house; and laying his hands on him he said, “Brother Saul, the Lord Jesus, who appeared to you on the road as you came, has sent me that you may receive your sight and be filled with the Holy Spirit.”
18 Immediately there fell from his eyes something like scales, and he received his sight at once; and he arose and was baptized.
19 So when he had received food, he was strengthened. Then Saul spent some days with the disciples at Damascus.
Acts 9:10-19