i am doing wrong or????

[Runescape]

i am a pure pve rogue lvl 21 and i feel so weak. when i get into a huge crowd fight or even 5 mobs, i have time to hit 3 times before others kill em way faster... feel like rogues aoe are bad. here are some screenshots

p.s sorry for links


now i have nox bolt with 2 points as i lvled twice
http://imgur.com/doItzYW
http://imgur.com/ekWPCTf
http://imgur.com/yLj3F77
n


edit
i think i know why, well now i added nox bolt for me aoe dmg and main reason is because i charge skills that doesnt need to and i charge normal attack which isnt needed