Have to play Sedna everytime someone decides to shield/lock as Oak?
Well from your stats, you really only play reg or DA, which is fine but your going to run into troubles late game with a well played oak or most generals since you don't have any real interrupt or stun (Swap is kinda an interrupt but eh)
When it comes to reg, in an even game, if it reaches late game your team is kinda screwed, since your trying to dominate early with ganks and upgrades to prevent it reaching that point. Also you can do little to stop anyone grabbing a port by yourself. (Esp against an oak).
Well played DA is a different story. However, I would suggest learning a general (which you rarely play from viewing your stats) with a stun/interrupt (sed, LE or Oak) to play if the other EQUALLY matched team has an oak and you have reason to believe it will come down to portals.
Best way tho is to distract them like Rawrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr (always forget how many god damn r's) said and to force the other team to play defensively.
