Like what? Why do you need to do these things before you come to God? Are they bad things or good? If they are bad, then you shouldn't do them. If they are good, why can't you become a Christian and then do them?
Nothing you can do could be more important than your relationship with God. To put Him off is unwise. What if you die before you become a Christian? Then you would be eternally without hope.
Your statement implies that you believe following God will mean that you won't be able to do the things you want to do. If that is true, then that means the things you intend to do would displease God. Are you saying that you prefer to do something God wouldn't want you to do? If that is so, you are willfully sinning against God and putting yourself in a dangerous situation. That is all the more reason you need His forgiveness.