Better safe than sorry? Should you confess if you're not sure if you've committed a sin? I’m guessing if you aren’t sure if you have committed a sin it is better to confess anyways than to be stuck in hell forever? Is there anything wrong with wrongly confessing or is it OK?
If you aren’t sure if you have committed a sin it is better to confess anyway?

If the action or deed may be a possible venial sin then one may go to Confession. It will not do any harm and one may even get some spiritual insight into leading a holy life.  

If however one is not sure if one has committed a mortal sin, one should go confession. Mortal sin for a Catholic must be confessed to a priest within the Sacrament of Reconciliation.


  Mortal sin destroys charity in the heart of man by a grave violation of God's law; it turns man away from God, who is his ultimate end and his beatitude, by preferring an inferior good to him. 
  
  Venial sin allows charity to subsist, even though it offends and wounds it. - Catechism of the Catholic Church.


If in doubt, it would be best to go to confession. If one did commit a mortal sin, one would be restored to the state of grace and the sacramental life within the Church. If one did not do a mortal sin, then one has gained insight into leading a holier life and obtained confidence in going to a priest in  the Sacrament of Confession as means to keep oneself holy.