Hi
This video shows me doing a few right and left kicks. Can you guys tell give me some advise?
I think im doing something wrong, especially with the left kick because i kick less harder with it.
When i train, i always do the left and the right kicks the same amount of times.
I will go against the grain here and say I don't really see anything terrible about your kicks, at least nothing that cannot be fixed. But always do what your instructor tells you, not random people like me on the internet. What follows is merely my opinion, which counts for nothing.
I will agree with the others that this is the type of advice you need your instructor for, not least of which because different styles of martial arts generate power differently, and deliver kicks differently. One is not necessarily better or worse than another, but they are different.
If you want my opinion, it is that in our style, the mawashigeri kick (roundhouse kick as you appear to be doing it), is delivered with the knee higher and turned over, such that the kick is not moving upwards when delivered, but sideways. You're almost there, just lift your knee higher and turn your hip over a bit and you've got it.
Second, control your hands. They are flailing around and that's fine for now, but you are using that arm motion to help generate power. That means when you actually need to deliver a big kick, you'll do that. And your opponent may well grab those hands. If they are waving around, they are also not available to defend or attack. Learn to keep your hands under control when you kick. You can grab your gi (if you wear one) or just hold your arms in a ready position and try to keep them there. It takes time for this to become natural.
You are also leaning backwards to deliver the kick, also part of how you are generating power. While this does give you some rotational momentum, it puts you seriously off-balance. A person't unbalance is the same as a weight. In other words, it is very easy to take someone down who is off-balanced. It is like they have to fight while carrying a log or something. Hard to stay upright.
So, in summary (and again, this is for the style *I* practice and keep in mind I am a student like yourself):
1) Lift the knee, turn the hip over so that the kick, when it arrives, is moving sideways with respect to the ground, not at a diagonal angle.
2) Get those hands up, protect your face, keep them there while kicking.
3) Learn to keep yourself upright while kicking, don't lean backwards.
Just my 2 cents. I don't really have a problem with your kicks as-is, but I'd talk to your instructor some more and see what you can do to clean them up, assuming your instructor thinks that is necessary.