Your not fat your just under tall. I am 240 but 6ft 7 If I was 7ft10 I would be underweight and over tall? LOL! In my opinion that poor 50 will be hurting in Colorado assuming its Colorado I couldn't imagine a big person riding a 50CC scoot up the mountain to reach mile high. If you were out in the dessert on flats I think it would be ok, but still underpowered.
Buy a 150, and put 50CC emblems on it. Just dont go over 35MPH.
Its not that hard to get a motorcycle license. Go online study the manual schedule a date, take the test. get ya a scoot atleast a 150CC and you are going to be much happier.
IMO a big guy riding a 50CC scooter looks ..... Ohh I wont say it..