I lead both "newbie" road and mountain bike rides and as a 50 year rider, have difficulty understanding the fear a new rider has but most do have some fear - it's normal. I do hope you have a friend or friends who ride. If so, ask them to come out with you one day and let them assist you with gaining balance, using hte pedal, moving the bike forward. One really big problem I see newbies do is that their saddle is too low and they tend to try stopping by putting both feet down at the same time. This causes falls more often than not. Try practicing this...

Both feet on the ground, straddling the top tube. Your butt should not be on the saddle! Put one foot on the peddle - either right or left, which ever you are comfortable with (generally right handed people feel most comfortable using their left). Make sure the peddle is in a slightly upward position so when you push down the bike goes forward. Push down and as the bike moves forward lift yourself onto the saddle and put your other foot on the pedal. Once moving forward now practice stopping properly. Use your brakes to slow... as you do your butt comes off the saddle and you put on foot down as the bike stops. One foot (usually the same one) always stays on the pedal. Once you get the hang of this, you can raise your seat to the proper height and gosh forbid, think about getting clipless pedals. The balance you learn doing this will also help you ride the bike.