Have you checked your knee position over the pedal spindle (KOPS)? If you don't know how to do that, you tie a small weight to a string, and have someone else hold the top of the string from the farthest forward part of your front knee when your pedals are in the horizontal (9 o'clock and 3 o'clock) position with the weight dangling straight down.

A good starting point that works for most people is having your knee right over the pedal spindle, but some do better with the knee slightly behind the spindle, which will bring you farther back on the bike. To achieve this, you might need to move your saddle back on its rails. It sounds like your KOPS position may be further forward than on your old bike. (I'm assuming you don't still have it so can't check). Very likely your top tube is shorter too. If you can't get your KOPS back far enough with your current seatpost (somewhat common in women since we have longer femurs for our height than men), a setback seatpost may be helpful. I've needed them on my road bikes to get me over or behind the spindle.

I hope this helps! A good bike fitter will know all this stuff, but it can be done at home as well.