Originally Posted by delbiker1

You state you just started cycling and went on a first ride. Of course you struggle to get up a hill! Keep riding and gradually pick up the distance and/or intensity. Upgrade yourself first. At this point, the bike fit and your physical fitness are having more effect than anything else. Not familiar with your particular bike, but it is a Scott,105 components and you state it weighs 20 lbs. If it fits you, it is a really good starter bike. Save your money until you know more about yourself regarding bikes. If it is something you want to continue with and want to better your equipment, get a new bike. In the long term, it is almost always cheaper to buy a new decent bike that you can afford, than to go piece together an old bike. I would say always if you are inexperienced.

I think you will be surprised by how quickly your leg strength, breathing and general conditioning will improve, if you stick with it. Even if you have bad health habits, you will still improve, albeit significantly less. For most of us, bicycling is just as important as a mental outlet and relief valve.