That doesn’t tell you which books belong in the NT. Jesus gave us a church to guide us to heaven.
He gives the holy Spirit to guide. If you haven't received the holy Spirit that's where to start like in Acts 2:38 and Acts 2:1-4. Jesus said to them to wait in Jerusalem until they were endowed with power from on high. He is sent to lead and guide into all truth. So you don't have to fear. As long as you listen to Him and believe then you will know the truth and the truth is able to set you free.
Howbeit when he, the Spirit of truth, is come,
he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come. (john 4:22)
Those filled with His holy Spirit are the "true worshippers" that "worship the Father in Spirit and in truth"
John 4:23
But the hour cometh, and now is, when the
true worshippers shall worship the Father in spirit and in truth: for the Father seeketh such to worship him.
So where ever two or three are gathered together in his name and filled with his Spirit; worshiping in Spirit and in truth; there it is that you have found his true church that the world cannot know because it did not know him.
Do you feel like that? Like you are hidden with Christ from the world? That they cannot see you unless God shows them? As Jesus was in the world and no one saw him unless God showed them. Then they knew he was the Son of God and that he was in fact even God himself manifest.