YTA right now. 

You have been pushy and overbearing, at the very least. 

And the fact that you started the post with “somebody voluntarily gave me her number” makes me think you’re not giving the full story. You ended the paragraph with “she gave it to me without me having to ask.” It’s the emphasis on her giving you the number that is coming across as odd to me. Like why are you so fixated on that? 

The message she responded about the zoo would have been enough for me to not want to contact her again. 

I can’t imagine harboring that resentment for 5 months, just to contact her out of the blue, ask if she had a minute, and then attack her for not rescheduling something almost half a year ago. That is not healthy behavior. 

I’d encourage you to keep putting yourself out there and possibly find a better friend/dating match (I can’t really tell here.) Maybe try some networking events or join a fitness or art class to make friends and develop new hobbies.