You will get stomped. Over and over. The more you get scaled, the less effective the scaling is. Also, your gear will be awful, you have hardly any passives or skills and zero champion points. So... Try going to the below level 50 campaign. That may be better although most people are just in there with alternate characters that have good crafted gear and know the mechanics inside out. But if you want to play PvP, that's where you want to be. You'll learn the ropes, better PvP rotations, how to keep up buffs and shields and when to use certain skills such as Damage over Times and executes. Until you get to Champion level and learn the PvPing mechanics and get all the relevant skills/rotations, you'll keep dying. All the time. Like. Straight away. I've only just started, I'm CP220 and I still get battered. But I'm slowly getting better gear, I've got my rotation down and have started surviving longer and getting kills here and there.

You will improve though. There's a lot of game to learn and play before being competitive in Cyrodiil but you'll get there. Sypher has some good PvP tips, I'd ignore a lot of Deltias stuff because... But keep up the YouTube searching. There are lots of videos showing PvP tips about crowd control and sustaining resources etc... Level 15 is very, very far down the food chain, so don't feel deflated because it's just a bit too soon.