What position should i play in rugby league?

I can pretty much play five eighth, fullback or centre but am trying to choose which is the best position for me. i am 14 years old, I am 5 foot 6 inches (1.68m), run 13.5 in 100m (pretty average for my age). i weigh 51 kg and have a pretty good kick on me. I am a very good tackler and a pretty good pass although i am inconsistent sometimes. My fend is okay and i have a good step, especially on lazy players. any help?