Welcome to Tapastic! I'm sure you'll like it here - we're a friendly bunch.
I think you can drop the defensive posture now that you're here (a posture that is very evident in your original post; take a deep breath and relax, you're among friends. No one is going to hijack your topic.) and I encourage you to take a more positive attitude, as jealousy is not going to get you very far. We really are nice here. Heck, this is the only place I know on the internet where we managed to have a really long thread discussing religon that never once descended into name-calling or insults. It was amazing.
Tips for getting attention on Tapastic:
1.) Update as frequently as you can, and as regularly as you can. You don't need to update every day, but having a regular update-day will make you seem more reliable, and people will be more likely to subscribe to your comic; they'll know that they'll be getting more of it.
2.) Be active in the forum. Link to your comic in relevant threads (i.e: the "Post the latest page of your comic!" and "Tell me about your comic!" or "Tell me about your characters!"-threads, and similar topics), but don't spam links in threads that have nothing to do with that kind of self-promotion.
2.b) In addition to the above - put a link to your comic in your forum-profile. For some reason, Tapastic doesn't automatically link your main-site profile with your forum-profile, so you have to do it manually.
3.) Be active in commenting on other people's comics. And I mean genuine comments, because you want to comment on the comic - don't just run in and say "Hi, I love your comic - do you wanna check out mine?". That's... yeah. Kind of rude. If you comment regularly, the authors are more likely to click through to your profile because they want to know more about you, and then they'll find your comic. Likewise, don't go posting on people's walls for the sole purpose of getting them to read your comic. Genuine interest is appreciated, and is more likely to be returned.
4.) Promote yourself on other social media-accounts, like Twitter and Tumblr and Facebook and whatnot.
Good luck!