ditto on just going out for a pleasant short ride to see how you feel. Like you, I started riding last year and trained for a century as a way to keep myself motivated. Then winter came, my routine came to a halt, and, well, I got totally out of shape. But as soon as the weather got better, I convinced my friends to join me on a ride (these are friends who stayed in shape all winter and didn't believe me when I said I was out of shape) and needless to say, they dropped me on that first ride out this past spring. But that didn't stop me from loving cycling, it just motivated me to get back into shape so I could keep up with them! Now, I am a stronger rider than they are (partly because they have so many other sports, and I just cycle) but we love hitting the road together. I imagine that if you get out there, you will remember what you loved about cycling and it won't matter that you are in the kind of shape you were last year (but I imagine you will get there).