Because you play on fairly new server you are simply behind in time (which translates into ninjas, initiative) in comparison to other servers. Everybody experienced the same, the upside of that is, in time, you will encounter people from even younger servers than your own thus giving you the upper hand. You may have problems with training arena right now, because theres event for 15 wins and a lot of people are doing it. After 2-3 days when most of the people are done with event, it will go back to normal "questing", so just wait until you can do the event yourself.

Sidenote: I'd advise you against even entering ranked arena for next 2 months, since right now you are a punch bag for others. Get your ini higher, get a good team and come back when odds will be in your favor. I've had xserver arena for 3 or 4 months now and just recently managed to climb up to super kage, it's simply no point playing rankeds early, since with current system you will only put yourself more and more behind than you already are.