A week into MFP

So I signed up here about a week ago as my trainer had suggested. I'm loving this site so far. I'm tracking my calories every day... I'm over right now but I'll be going to the gym tonight to burn some off. I have about 60 pounds to go.
A little about me, I'm 32, 5'8 but not comfortable disclosing my weight quite yet. I started going to the gym at the beginning of April and have been going 6 days a week almost every week for 1.5 hours to 2 hours each day. I'm down 12 pounds since I started at the gym which I feel is very discouraging. I thought I'd be able to have better results in this time. I'm hoping it's muscle I'm building up though.
My calories so far have been under almost every day, since I burn so much at the gym, the last couple of days I've been under by over 1000 calories. I'm not trying to eat very little, but I haven't been hungry for more.
I was literally addicted to Pepsi (2L per day) and coffee (1-2 XL timmies), but I've since quit that almost completely (I do have a pepsi sometimes if I'm out with friends)
I'm not on a diet though, I keep telling myself this because I want it to be a lifestyle change, the work diet means temporary to me. Not judging anyone who is on a diet, I just know myself that that's all been here and now thing for me.'
I have a desk job, but I sit on a ball instead of a chair also.
I'm really considering getting the fitbit as I keep reading really good reviews on it but the price tag is holding me back.
Anyways, I've yapped enough so I'll shut up now.
Looking forward to getting to know you all a bit better.