I don't have a spare one, but if I did, you could have it. ;)
I understand tight budgets, but honestly I can't imagine how/why you would hate it. Yes, you are modest...but...it's a swimming pool...the right equipment will make all the difference! Even if it doesn't instantly "fix" your swimming issues, I wouldn't recommend "going back" to the shorts. Just get the gear that works. How many women do you see wearing t-shirt and shorts to swim in? (Yes, i know, a few...but not the ones that want to be graceful swimmers).
One of my new favorite quotes may get you over the hurdle..
"We swim because we are too sexy for a sport that requires clothes."