Unfortunately until you can get pvp abilities like equanimity, attunement, and purify there isn't much you can do outside of sprinting and taking advantage of pillars/walls to get a quick heal off. Sleep is also your friend to keep people off you, just watch for people to use their own purify and try to swiftcast a sleep on them. It's a rough start but luckily even losses give decent exp now, so it shouldn't take you too long to get the abilities you need.