As long as the saddle is high enough (when pedal at lowest position and the ball of your foot on the pedal, knees should be bent about 25-30 degrees; alternatively, when pedal at lowest position and your leg locked straight, you can barely touch the pedal with your heel) and tires aren't scary (cracked), ride the bike as-is for a few months.

I, too, think the bike is is too small for you, but it is fine to get you introduced to riding.