I, too, have a horrific lack of experience when it comes to girls/women as well, though a bit worse off (lucky enough if I can even get a date (they've been few and really far between)); but yeah, be a companion or a partner, but don't become a pet. I used to be "The Nice Guy", and I at least, eventually, learned the signs to watch out for, and corrected myself accordingly (and better results have been coming up more frequently). But yeah, you always say yes, your ability to say no will diminish due to being the reliable "yes man" or "nice guy" she'll resort to contacting for an ego-boost.
As long as you remain a person, you'll be respected as a person. Just stay true to yourself, and be a good person, not a "nice guy". "Nice guys" are dime-a-dozen pets to girls, and can never place (1st/2nd/3rd/etc.); reason they "always finish last" is because they are pets, and are only treated as pets; Since when was the last time you saw a nice guy eat at the same table as their intended love interest (without an ego-boost purpose)? As a "nice guy", cutting your losses and accepting your failures as the only option (provided you learn from them) is the best path to take once labeled. That stigma is hard as hell to remove, and sometimes requires a total personality overhaul to get rid of it. I'm not advising to become an asshole, but standing your ground when challenged or forced into the "nice guy" role is only interpreted as an asshole trait if you can hold it well against a stubborn person (much of the time, clearly in the wrong); generally used as a disciplinary measure to revert nice guys who've had enough of their crap, back into the lowly pets they once were. Such methods were used a few times against me before, now that I recall in hindsight (and furthermore in hindsight, I've accepted that they likely wouldn't have been worth my time in the long-run, especially if I were to expect more of the same).
EDIT:
I apologize if I offended anyone with this statement, and came off any bit bitter, but I speak from experience. Speaking of which, I have been accounting my many (many) failures as data I could use to improve my situations, as well as craft some useful advice with (at least to get out of the "nice guy" woods), instead of just plain losses in general, which have no yields I can work with.