Well, the expression 'I am crucified with Christ' might lend to this, but if we are not very familiar with the NT we might imagine it is some deliberately painful or ascetic (denying-ourselves a normal need or even pleasure). But the thing has a context which is Galatians.
When things are in Galatians you really want to pay attention because although the document is a letter, not a narrative like Matthew or Acts, there is a fair amount of social interaction going on--people being obtuse, arrogant, quarreling, censorious, and so forth. In other letters, these features are missing and they aren't quite as clear.
Now the thing about Galatians is that Judaizers said a Christian needed to add circumcision on to Christ. (There are other things that could be added at that time--sabbath observances, washings, trips to Jerusalem for festivals, and even blocking off visitors because they were Gentiles). The Judaizer said that a person was not really a Christian until they did this (fill in the blank).
Now comes the expression 'crucified with Christ' or later 'to preach only the cross of Christ.' Paul meant that the Judaizer was so nasty that he was actually 'killing' the believer who had welcomed uncircumcised Gentiles simply because they believed on Christ's work for them, and didn't add on. In spite of this re-done 'crucifixion' by the Judaizer, Paul still lived, or actually Christ, was still alive in him.
As further clarification of how things were used in this setting, Paul said he was crucified to the world, and the world to him. This again had to do with Judaizer's insinuation and persecution. The world was not the secular system or alcohol or other vices. It was the unbelief of the anti-social Judaizer and it was ruining Paul's fellowship groups. The cross of Christ was Paul's only basis for fellowship, no matter what tribe, race or gender the other believer was. So Paul was 'crucified' (dead) to the demands of the Judaizers. And the Judaizer was dead to him--he didn't jump when the Judaizer said jump. Notice that half of the works of the flesh are divisive postures. No wonder.