I am having a hard time being nice after attraction. I am naturally cocky and it works fine up until a point, but then the girls always say that i never say anything nice. So I am having trouble being nice without beeing needy. Like today this one girl got a bit angry with me, so before I left I told her I like her and I want her to be mine i've been seeing her for two months now. It seemed okay to say that at the time, but now i regret it and feel i was beeing needy.
How do i balance being nice and not needy?

Yeah. Be nice. Go back to the pussy you once were.
Whenever they say something similar to "Why don't you ever say something nice?", agree and amplify. Say something along the lines of:
- "There's a reason for that."
- "Because you don't deserve it.", then slap her ass.
- stop, look at her as if she's the mother of you children and you love her for a second, then say something
like: "You have nice hair." It has to be said with honesty. Then, pull the rug and follow with: "Is it a wig?"
- Say "Did you know that when you laugh, your nose bounces (that's too strong, use another word) a bit? It's adorable." wait a second, then say: "I'll post it tomorrow on youtube. Man, it'll make so many views!"
- If you geniunely want to say something nice about her, let it be something she's never heard before, as she's not expecting it

It's not about beeing a pussy, it's about showing a different side of myself. She already knows i'm a confident guys. the last advice is probably what I am looking for, compliment her on something thats different about her.

If you ask me, I see two problems:
1. Unclear about what constitutes being nice.
2. Signs of neediness.

1. Nice and needy are not the same thing, nor does one imply the other. (I wonder if they even correlate in the grand scheme of things.) The keywords in being nice are sharing and giving, e.g. sharing a story, sharing an experience, giving a compliment, giving a gift. Being nice is not necessary to get a girl, but it can be helpful. Moreover, the world would be a lot nicer place if everyone was just a little bit nicer. So being nice is good. Neediness, on the other hand, is not good, neediness is bad. Neediness is not a behavior, like being nice, but a motivation of behavior, like being nice because you need someone to like you. Being needy is unmanly, unattractive, and unenjoyable (I just invented that word, but you know what I mean). Needy people are supplicants, they are begging for kindness and love. And you know what they say about beggars: they can't be choosers (nor do I think hobo's bag lot of women, but what do I know).

2. You show some signs of neediness. You said you liked her (sharing your feelings, thus good), because you wanted to stop her from being angry (supplicating, thus bad). The reason to tell a girl you like her is because you want to tell her you like her, not because she is angry with you. One a side note, if someone is angry with you for a legitimate reason, apologize. Most times though, women are angry with men for reasons that are entirely unreasonable. If you think the latter is the case, don't apologize. In fact, point out that the woman in question is being unreasonable. If she continues to be unreasonable, ignore her (known as the soft next), or even move on to the next woman (known as the hard next). If you react to anger in any other way, her anger becomes a way of controlling your actions: you become an unattractive and unhappy supplicant. Anyway, there's no need to regret it, what's done is done, and the lesson is learned I hope. Actually, there are many men who do not realize their mistakes until they are dumped by a girl (like me), or they don't even realize them at all. So in a way, you're ahead of the curb.

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One of the most useful things you will ever learn about body language.

I dont know when people started thinking nice and needy are the same thing. They are two completely different things which just happened to be found together a lot in guys who are overly nice. That doesnt mean be overly douchey. Here is a nice example

Your walking with your girl and she is obviously cold or even more direct, tells you shes cold. You think being nice and giving her your jacket is needy? No its actually quite the opposite yet your still being nice. If your seeing her you should want to be nice to her...

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FAIL PROOF PICK UP LINE: excuse my, im sorry to bother you but my father beats me, can i have your number.