Ok, I will help you out here man.
There is a big big difference between being a leader and a boss. Just the same way it is a big difference between being an alpha or a beta trying to be alpha.
The leader leads, the boss bosses people around.
For example, the alpha male will not be mean or treat people in a bad way. Why in the world would he wanna do that.
The reason people treat each other bad is usually because they feel threatened in some way. Either by a challenge or by the fact that the other guy may be even more alpha. Hence, you are not the alpha male, you are beta. If you meet another guy who is cooler or that you are not sure where you stand against, you are beta. A lot of people would say that this depends on the situation. But it doesnt. If you are truly alpha, you can appreciate or even admire a guy with extreme inner game. You feel happy to meet him. He is pleasant to be around and there is no challenge, none of you have anything to lose. Both of your statuses are so high that you cannot bring each other down, only increase each others statuses.
A beta male thats trying to be alpha act like the people I think you refer to. They can not take a challenge. They talk like they have all the answers and like they are the shit. They try to convince everybody that they are the best and coolest guys alive and that they are superior to everyone. They might even insult people on pickup forums.

A true alpha male wouldnt do that. He would not even need to face the challenge, he has already won. He does not need to convince anyone, it is obvious that he is alpha. Nobody can take that from him so why would he even bother. He acts like a friendly cool guy, because he is not trying to be better than anyone, if the situation presents itself, the outcome will be obvious.
The beta male is always on guard for people who might damage his status. The alpha male is above such nonsense. A challenge is childish and not even worth his attention, he ignores it.
So basically, there is no way to act alpha without risking that people will find out. In order to act truly alpha, you have to become truly alpha. You need to build up your confidence, you need to search yourself and rid yourself of all those fears you have. All insecurities. All doubts.
Another thing I reacted on was that I get the feeling that you refer to your old friends, like before you started doing pickup. It is not so strange that they think that you are acting like an idiot. You completely changed your behaviour into someone they dont know. Not so good.
I have grown into my role so it doesnt seem unnatural anymore. Thats why my friends accept it. And Im not trying to be someone Im not. That is also important.
Be friendly, be humble and be fun. But if you do that with weak inner game you are a loser and if you do that with strong inner game you are untouchable. It may not make sense right now but it will. Girls can tell the difference. Why are you acting nice, is it because you dont wanna play with the big guys or is it because you dont wanna play with the small guys? They are the same guys, it is only your perspective that changes.