Who is Jesus Christ calling to train for His kingdom?
(16) For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life.
(17) For God did not send His Son into the world so that He might condemn the world, but that the world through Him might be saved.
As you have read, Jesus calls everyone, whoever you are, to believe in Him and offers us everlasting life, that is, immortality. It is important to ask the question "Who does Jesus exclude in His offer?". The answer is that nobody is excluded.
Hence, the invitation is to the lowest human being to the highest one. Think about the lowest human you may know and do not know, Jesus asks that vile human being to believe in Him so that he can be saved from our lost world and live eternally. Think about the highest human being that you may know or do not know, Jesus asks that formidable individual to believe in Him so that he can be rescued from our lost word and to regain the lost immortality. The world is considered already lost because Jesus was sent to save it.
The salvation that Jesus offers the world is only valid with Him and through Him as verse 17 implies. There is nobody else involved in the pledge to validate and redeem it, not even Mary His mother because the only requirement to be saved from our lost world and receive everlasting life is the belief in Him, Jesus, the Saviour (John 3:16.17; Acts 4:12).
Thus, Jesus does not care about you think you are, He is calling on us to believe in Him because He knows that our world and all that is in it had been lost. Our world was so badly lost and it is so bad that Jesus had to die to save all of us who believe in Him.