PVP is a occasionally fun event for me as well. Sometimes I seem to hit a group of relatively equal skill, but most often this has not been the case. It might be a difference of character level, higher grade equipment, or just an insane degree of personal skill on the player's part...but, yeah, I don't win too often.
My personal advice is to stick to one character until you hit your level cap. Do all of the Planetary Missions, including the Bonus Series, and you'll find yourself advancing at a fairly swift pace. You can also do other Missions if they aren't repeatable. So skip the Daily, Weekly, and Heroic missions until the second or third playthrough.
Once you do hit level 60, you'll have plenty of Credits and Planetary Commendations, a fully trained Crafting Skill to benefit yourself and your other characters, and all of your abilities will be at their maximum rankings. At which point your time with PVP will be a great deal easier. You'll also get to play some of the best stories in the MMO genre in my humble opinion.
I hope this helped, even a bit. And welcome to the community.