Congratulations on your weight loss. :-) Please do not give up. I too an quite new to bike riding, I have only been doing it for a week. I went on my longest ride last night (7.4 miles) with real hills. I was so proud of myself and I could have continued but my riding partner (husband) was beat.
My bike is quite nice, but now that I am loving biking I am going to see a need to upgrade to a non-comfort style bike. I do not know what style of bike you are using, but mine is a "comfort" style bike. It was the bike I was most likely to get on and it worked like a charm. When I first sat on the bike I was so nervous I thought I was going to be ill (yes, I was that terrified of bike riding). After 1 week my confidence is stronger and I am really enjoying myself. I make small goals for me and have not let myself down yet. Oh, the first few days, my children helped me learn in the cul-de-sac. I was a tad embarrassed at first and then my neighbours started calling out words of encouragement.
I mention all this to show you that you are not alone.
Keep trying. Set small goals, if there is someone who you can ride with, do so. Visit here often for support. I have found the advice given here to be fantastic. I *almost* did not join because I thought I would need to have a racing bike and have logged many, many miles. I am glad I did not hesitate to join. Next year I foresee myself buying a non-comfort bike.
Jennifer
“Live as if you were to die tomorrow. Learn as if you were to live forever.”
-Mahatma Gandhi
"We are what we repeatedly do. Excellence, therefore, is not an act but a habit."
-Aristotle