Help! Help!! Help!!! (Need 0.002 ETH)

[Asbab4real]

Hello my fellow friends, am newbie to altcoin trading and i mistaking send my ether token to decentrex exchange but I want to withdraw it back but I as to have 0.005eth before I can withdraw but i only have 0.003eth. I will be very grateful if anyone can help me out with 0.002eth i will be happy. My eth wallet address 0x49Ea7b1834C816FA4c2F9D0CD21d9550bF3655CA