I NEED A COPY OF MY 2015 RETURN FOR A REFINANCING BUT IT SAYS ITS 137 PAGES LONG

That includes all the worksheets.

You can bring up the return in a PDF viewer and select which pages you want to print.  i.e., you can print just the pages that comprised the submitted return.

You can get a free transcript from the IRS:   

https://www.irs.gov/individuals/get-transcript