I would make two suggestions. First one, living frugally is a point in your favor, in my option. Market it as such, talk about why living that way is important to you. If a real potential partner sees that there is really thought behind it, I am sure that there will be less of a reaction to it.
There are lots of folks out there that like to lessen quality and excuse laziness as being frugal. They are not the same thing.
Now in that same vein, I would encourage you to think out side of the box when it comes to dating. Instead of letting someone know that you can not take them out to a 60 dollar dinner, make a beautiful picnic and take them to see the sunset.
Find a nature trail that you have already walked and hid a small surprise for your date along the way.
There are tons of high quality thoughtful ways to woo someone and not come across as cheap. ;)
Best of luck, hope you find all you are looking for soon.