I read an article once, sorry I don't remember where, that sounded like good advice: Increase your mileage at a rate of no more than 1 mile per day or 5 miles per week, starting with a ride of 4 or 5 miles (which you did).

I've been riding my hybrid for 5 years and I rode a road bike exactly once. I hated it. I suppose I should give it another chance, but I haven't gotten around to it. Why would I? I love my bike so much!