I have 3 bikes and only one is under 18 pounds at 17.75. It weighs a little less with lighter bars and stem than the others that have integrated bar/stem and lighter 29mm deep climbing wheels. Don't forget that aero wheels are heavier, but improve speed with aerodynamics. It takes a lot of money to save a little bit of weight from several different parts.
If your routes don't include a lot of climbing, a little extra weight won't slow you down significantly. I ride 50 mile routes with 3500 to 5000 feet of climbing. I did 400,000 feet of climbing last year.
Although others have been critical of mentioning body weight, it does have the same effect as bike weight. If there's 2 pounds to lose, do that first.