Instant Trouble

I ended up back home really late. Mum went mental as expected.

"What the hell were you doing out so late?" And she went on and on and on.

I stormed off to my bedroom and signed on msn.

Kyle says: Hey how r u?

Amelodramaticemergency says: hey dad, i only saw u about ten mins ago

Kyle says: What the hell are u on about?

Amelodramaticemergency says: Dad its me

Kyle says: I'm not ur dad. I'm 14...????

I looked at the computer.
'What the hell...?' I muttered to myself.

If the person on the computer wasn't my dad, Then who was he?