New to MFP

Hello everyone. I just started the "website" today, but I have been using the app on my phone for about a week now.
I am 25 years old and stand at 5'3 and I have always been over weight. I am starting my weight loss journey and I know its going to be a hard one, I find that I don't have motivation to get off my butt and work out, even though I want this so bad. As of last thursday I was a 267.4 pounds and as of an hour ago I am now down to 264 pounds. The thing that really bummed me out this week was I was down to 261 pounds 3 days ago, which was fantastic! But I caught a stomach virus and no working out for 3 days made me gain almost all of that weight back, which sucks so bad. I use the MFP app to keep track of the calories that I burn, sometimes I input food, but I rather see those calories inside that I am melting off. Though I don't exercise much and those calories don't go above 600, I think I am off to a good start. I even found out that my favorite hoodie weighed 1.5 pounds, which had actually surprised me more than my weight. lol
My workout includes a stationary bike which I peddle on from anywhere between 10-30 minutes a day and I even walk all around my house in every room, the bathroom twice between 10-20 minutes after peddling for a "cool down".
Of course being at currently 264 pounds, its my dream to be a size 7 in pants, I don't even know what size I wear in jeans since most of the time I am either in sweat pants or pj pants all day long.
But I am up to gaining some motivation from everyone here and even making friends!