1. I feel really confident before to reaching pickup field, but when i start approach i really feel low value many thoughts comes in my mind like its wrong no one do so i am only the creepiest guy.
2. Second thought will be regarding set will get offended so i should not use direct opener.
Before approching i become nervous and same state is transferred to set.
These two factors will contribute to the 3rd. You will have a hard time being creative and in the flow of things when you are tense and/or nervous.
Find ways to get out of your head. Meditation is a good practice for this. I also feel more confident right after a short workout.
3. My mind becomes blank after opener don't understand what should i say next.
How do i overcome above 3 factors?
I find when daygaming for the sake of daygaming, this happens. If I am in the flow of my day and come across a beautiful woman on the way, she can enter into my "adventure" and I have plenty to say about that. So if you add in a little "goal" on your day game session this might help, like picking up something along the way, checking out a new place or even just having a greater focus on getting some fresh air on a nice day while stretching your legs.
A lot of guys want a formula for getting out of their head and having things to say. In my experience the solution is more nuanced than that, it's about your internal state and the direction of your focus.
If you're in a nervous mood and all your attention is on her, you can see how that isn't a great source of inspiration for conversation.
However, if you are in a good and relaxed mood, and you have your attention on your surroundings, you have a better source for topics.