I agree with Veronica......... if you can only get one bike, don't get a hybrid. It will not be able to handle any vigorous off-road stuff. At least you can put slicks on a mountain bike and take it out on the road. It'll be hard to keep up with riders on road bikes but it will make you stronger trying.
Someday, maybe you'll be able to have both.
Time is a companion that goes with us on a journey. It reminds us to cherish each moment, because it will never come again. What we leave behind is not as important as how we have lived." Captain Jean Luc Picard