I want to get married! but....?

i have been with him for six months i really love him alot and know he loves me but is it too soon? wewerent gonna do it now probly wait another year. but is it a bad idea to tie the knot in general????? i am so worried about getting old and fat and my hubby cheating on me with a woman at work, or just any random young tramp....u know the kind...u could say im the jelous type...im a pretty girl but i dont exactly love myself. what are the statistics of men cheating on there wives.??