First off your weight is fine and not causing any issues.
Second, you don't want your leg straight so where it's out now is close to right, how close I can't determine without being there and seeing you ride it, but a rule of thumb is
Third, the saddle is probably the culprit, but what is causing the saddle to pain you? is the saddle or is it the position of the saddle?
Fourth, it may be the handlebar position.
Always try the cheapest thing first so instead of jumping ship that could still be floating just fine and getting a new saddle first try to adjust the saddle differently. Start out by putting a bubble level on your saddle length wise and adjust the saddle so that the bubble is centered, then ride and see what happens. Never assume you need a wider saddle or a narrower one, you might need those but don't assume because if you go out and just buy it and it doesn't work you have a saddle you can't use since most LBS's won't take them back after they're used, but check with your LBS to see if you can take a saddle back.
If no improvement then read these sites and try to do a self fitting before seeing a pro fitter:
https://cyclingtips.com/2010/04/science-of-bike-fitting/
https://www.bikeradar.com/road/gear/article/how-to-get-your-seat-height-right-14608/
https://blog.bikefit.com/how-to-fit-a-road-bicycle/
Now if after you read those sites and tried doing ALL those adjustments and you still have a lot pain then you might want to consider a new saddle. Read how to select a saddle, but most LBS's will know how to measure your sit bones and find the right width of saddle for you.
A pro fitting, depending on where you live, are mostly level 1 fittings which someone trained some high school or junior college person in about hour or two and classify them as pro fitter...surprise they're not! All they really are is parts sales people who will try to sell you a bunch of parts you probably don't need but it does provide a good profit to the LBS! So if you live in a larger city get referrals from people you know who they use for fittings, but I would seriously try it yourself and just work at it, it may take a month to dial yourself in but it's a lot cheaper than a pro fitter and depending on the fitter could be just as good!
Let me repeat myself on one important thing, when it comes to anything bikes (or cars) always do the cheapest thing first, never assume that the most expensive thing is what needs to be done, you start out with the cheapest, which in your case will be free by following the internet sites I gave you, then go to the next cheapest, to the next, etc.
By the way I would take the saddle cover off.
