what if jesus is both the first and the second ? cuz the first adam should be our "Dad" someting like that, who should given up his life for us ?
Adam was a created man, Jesus is God in the flesh, Who pre-existed with/as God prior to Creation.
Adam is referred to in the New Testament as 'the first Adam', because he brought sin into the world, and all who are born, are born 'in Adam' and die.
Jesus is referred to in the New Testament as 'the Last Adam', because He was born of the Spirit and brought righteousness into the world, and those who believe in Him are born again into Christ, 'the Last Adam', and receive life:
20 But Christ has indeed been raised from the dead, the firstfruits of those who have fallen asleep. 21 For since death came through a man, the resurrection of the dead comes also through a man. 22 For as in Adam all die, so in Christ all will be made alive. (from 1 Cor. 15)
45 So it is written: “The first man Adam became a living being”; the last Adam, a life-giving spirit. 46 The spiritual did not come first, but the natural, and after that the spiritual. 47 The first man was of the dust of the earth; the second man is of heaven. 48 As was the earthly man, so are those who are of the earth; and as is the heavenly man, so also are those who are of heaven.49 And just as we have borne the image of the earthly man, so shall we bear the image of the heavenly man. (also from 1 Cor. 15)
This passage in Romans also clarifies well the issue of the difference in the 'two Adams':
14 Nevertheless, death reigned from the time of Adam to the time of Moses, even over those who did not sin by breaking a command, as did Adam, who is a pattern of the one to come.
15 But the gift is not like the trespass. For if the many died by the trespass of the one man, how much more did God’s grace and the gift that came by the grace of the one man, Jesus Christ, overflow to the many! 16 Nor can the gift of God be compared with the result of one man’s sin: The judgment followed one sin and brought condemnation, but the gift followed many trespasses and brought justification.
17 For if, by the trespass of the one man, death reigned through that one man, how much more will those who receive God’s abundant provision of grace and of the gift of righteousness reign in life through the one man, Jesus Christ! (from Rom. 5)
I hope that helps you to sort it out
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-JGIG