You can be totally out of shape and weigh X number of pounds and look like a blob of pizza dough....OR you can be fit and in shape from riding your bike and actually weigh exactly the same but have a great looking athletic body.

I weigh the same as I did 5 years ago but my body shape looks nicer.
Don't worry so much about the pounds, concentrate more on getting into better condition....the changing shape will start happening all by itself over time. If you keep riding your bike or doing various exercise frequently, one day you'll look in the mirror and say "wow, is that me?"

Be sure to fuel your body properly when exercising. Read up on that a bit if you're not sure. The goal is to get healthier, not to get sick.