That long stretched position works for me aswell but does not for everyone.

I rode MTB's and when I changed to road I got a bike that felt right on length but soon found out that I had got a size too small. No problem- Longer bar stem to push the bars further away and even raised the bars to get the more suitable position for my ageing back. Soon found out that I had it all wrong and a year later got a bike that fitted. Longer top tube and lower bars was how this bike was set up and it worked.

On the dismount. With the bike properly set up I cannot touch the ground with my feet when on the saddle. I also have the problem in that there is minimal clearance from the top tube with feet on the ground. Just lean the bike to cure both.

You do need the LBS to help with that first bike fitting. A wrong size bike and even the correct size not set up right will not help your back or your riding.