I don't think you're a creep. But I do think (and I'm sure you know this) you should not do this again. In my opinion, it's okay to google your T, think about your T a lot, listen to T's voicemail, etc. because that does not hurt your T and it brings comfort to you. But following your T or waiting for your T in a parking lot would scare or unsettle her if she saw you, so I think that's over the line. Even though I know your intentions are innocent, and I know you're doing it to comfort yourself and not to hurt anyone!
If it makes you feel better, I used to do this. I knew the apartment complex my T lived in and I would go out of my way to drive past it, hoping for a glimpse of her. I was never brave enough to tell her about it, but I know it would have helped me if I had. I hope you can find the courage to talk this out with your T.
Sorry your sessions are farther apart now, I know that's hard.