I'm 13, and I can kick 40 yard FG's, is that good?

Yes, considering your age, your stats are very good. Keep in mind, the average 13-year-old kicker in football should be able to kick a long field of approximately 30-35 yards.

By the way, here are 7 tips/techniques you should use:

1. Have the ball held with the laces pointed away from you. It should be straight up and not leaning a little the other way of the side you are on, or as you progress with your kicking you will learn which way to have the ball leaning (if any lean at all).

2. Take 2-6 steps backwards (whatever feels comfortable) and 2 steps to the opposite side from your kicking foot (left if you are a rightie, and right if you are a leftie).

3. Look at the uprights (goal posts) and imagine the ball sailing through. Then give the holder a signal that you are ready and think about how you should be kicking the ball. Don't think about the score/if you need to make this to win the game... always think of your structure.

4. Your first actual step should be with your kicking foot, turning it just a little bit. This is called "prelock"ing your foot.

5. Your last step before you kick the ball will be your plant step. If you are kicking off-the-ground (college or pro players), your ankle should be in front of the ball to give the ball the height you need. High school players using a 2" tee should have their toes in front of the TEE to also give you the height you need. high school players using a 1" tee should have the arch of their foot in the middle of the tee to give you the height you need.

6. Keep your head down so you don't kick the side of the ball.

7. Follow through. Flexibility is key with your follow through; the higher you follow through, the higher your ball will go.

Yes that is pretty damn good for your age! Get with a trainer and do the right weight training, leg workouts, hip flexibility, etc... Get a hip MRI to make sure your hip is in good shape.. etc

Is this with or without having to kick over the defense? There's a huge difference.

Yes.

It's a good lie.

Five years ago when you were eight.

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Yes. The average 13 year-old can't make a field goal from any distance.

I think it's pretty good :)

That's good at your age.