Wow! Well, it certainly sounds like you're getting your baptism by fire, and believe me, you'll be all the better for it.
Without going into a blow by blow post mortem, I would like to give you some general advice (and we all know the value of free advice, don't we?)
The best thing to do is step back a little, breathe, and do some serious thinking. And not about tricks--those are merely the tools of what you'r doing, which is entertaining and engaging the audience. Performers do this in a multitude of ways--you're choosing to do it with interactive magic.
Now, put yourself into the mindset of a child in the audience. First of all, you don't want to be talked DOWN to--ever. This is a given. Next, you better be fairly happy to be there. By that I mean, you can't coast with kids. They pick up on it in a minute.
And lastly, they want the performer to take control. Children (and adults too, but that's a different discussion) crave control. If you are able to control the here and now, then they can relax a little, and relinquish the tentative control THEY have on the situation.
If you're uninteresting or weak, they will take over again and talk to their friends, crack wise, or just goof aff--they are at a party, after all, and their top priority is to have FUN!
So, you must engage them immeidately and demonstrate that YOU are in control and that YOUR primary objective is for THEM to have fun. If they see this, then things start out much more easily. You've built a little trust, and this is tough for magicians because our reputation is not a trustworthy one.
Next, take a look at who you are. Are you a big, strapping person, with a loud voice and good physical presence? Are you small and unassuming? Are you somwhere in the middle and aren't easily categorized? You most likely identified with the last one, and this is also something to consider.
The people in the audience will want to know who you are right away. Kids are pros at this. They may jump to an incorrect conclusion, but jump they will. Therefore, you must guide them to the conclusion you want them to make. This comes from developing a very strong sense of who you are and what you have to offer them.
Do you have a theme? This may sound weird to you, but think about it. Are you, "Mr. Happy who is dedicated to making everyone in the world LAUGH!" Or are you "Mysterioso--the man of mystery who wants to put everyone under his spell!"
I think you see where this is going. When you have a theme, a direction from which to start, then a lot of other things fall into place. You can now frame your magic with something, and patter lines and business will begin to come much more easily and organically, rather than having to jump from trick to trick in a disjointed manner and for no apparent reason.
When these kinds of issues start to gel in your mind, THEN you can start thinking about the tricks again. They'll begin to make more sense. You'll want to accentutate certain things because they FIT with your persona and your theme, and you'll want to shelve other things because they just don't work. This doesn't mean that someday, they won't be appropriate again, but right now, they just don't work--so don't waste time on the square-peg-round-hole problem.
Lastly, you're working venues that could make anyone weep. There are tricks of the trade that I'm sure you can obtain through careful research. Also, you'll discover things that work for YOU that wouldn't work for anyone else, simply because you are who you are.
All in all, you're on the road to a lot of education and a lot of valuable experience. Always remeber that every "failure," and I use that word loosely, is simply another chance to learn. There will come a day when you walk out of your show and think, "Hey, that wasn't half bad! Now, let me work on the stuff that isn't quite right." There will be no more self-beatings!
Take care and enjoy the ride.