Since many in US are entirely allergic to metric measurements— OP weighs 120-130kg, which is 264 to 286 pounds.
OP is attempting to ride on a 145mm saddle. That just won’t work. The saddle is made for young racers. Again have to guess that most here have no idea what 145mm looks like. Myself I ride old school leather saddles that are 138mm to 152mm. I am just under Clydesdale weight, exceed it occasionally in winter. Whichever saddle I ride, pretty much every time I ride with a group there will be multiple expressions of amazement that I can sit on something so tiny. It is possible for me because my hips are narrow and I have over 50years with no break from riding these saddles. Most who would wish to test ride any of my bikes quickly surrender from inability to ride one minute on a narrow saddle.