Well, with all the expert advise above, let me add my two cents.
Repeat: Keep riding.
Your weight on the saddle will not be your main concern once you get serious.
Properly balanced, your weight should center on your legs balanced by your hands on the bars (Elbows on Aero Bars) and on your saddle. You should be able to lift a little off your saddle from time to time to get the circulation going. That I find is very important on long rides. Cannot cut off circulation. It will hurt.
Of course the type of saddle is important. I have a Brooks Champion Flyer, a Specialized cut out and a big fat Gel for a Tandem. All are OK provided I do what I say above. I cannot sit solid on any saddle for a full day without proper balance of my weight. (190 lb.)