You are made "worthy" of heaven by grace through faith in Jesus. You become "worthy" of Jesus by becoming His disciple - by denying yourself, picking up your cross and following Him.

(Matthew 10:37,38)
Jesus said, Anyone who loves his father or mother more than Me is "not worthy of Me"; anyone who loves his son or daughter more than Me is "not worthy of Me"; 38and anyone who does not take up his cross and follow Me is "not worthy of Me".
  
Eternal Life and Heaven is the promise of Salvation and this is not earned.
POSITION and Rewards are the Promise of service and relationship to the Lord.

For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, 9not a result of works, so that no one may boast. 10For we are his workmanship, created in Christ Jesus..... for GOOD WORKS, which God prepared beforehand, that WE SHOULD walk in them.

(Ephesians 2:8-10)
Not all believers receive the same POSITION and REWARDS because not all have the same relationship with their Lord and not all are faithful to His commands and endure to the end.
Every believer has the potential of a "Full Reward" or a complete "Loss of Reward" depending on their faithfulness to Christ.

(Hebrews 3:13,14)
We must WARN each other EVERY DAY, while it is still “today,” so that none of us will be deceived by sin and hardened against God. For IF...…..WE ARE FAITHFUL..... TO THE END, trusting God just as firmly as when we FIRST BELIEVED, (Then) we will share in all that belongs to Christ.

The POSITION as Christ's bride is decided upon by God and not us. As Eve was taken out from Adam's body to be his wife - So will the bride of Jesus (the second Adam) be taken out from His Body.
Not all in Christ's Body are His Bride only those whom He counts as "WORTHY" by relationship.

Revelation 19:7
Let us be glad and rejoice, and give honor to him: for the marriage of the Lamb is come, and his wife has MADE HERSELF READY.

Luke 21:36
Watch ye therefore, and pray always, that ye may be accounted "worthy to escape" all these things that shall come to pass, and to stand before the Son of man.

Salvation is for all who call upon the name of the Lord.

The Rapture is for those whom the Lord chooses as His Bride.
 
Those who are SAVED, but who are left behind are not the Bride.
Their relationship to Jesus will be tested by Great Tribulation.