Already been said but it will get easier. The people I truly respect are the ones who started off in not very good shape and who I could tell were pushing it hard and then a few months or years later look like totally different people. There is a guy like that I see on my commute (22 miles roundtrip) who has totally changed in two years. I started off in so-so shape 3 years ago and having to leave my bike overnight because I could only do one way per day. Now I'm doing my commute roundtrip about 3 times per week, could probably do it every day but I have other things to do as well.

Stick with it and you'll build up a good foundation of general well being. At least in Kansas it is generally flat, been all over that state!