Could you tell me what will i feel like the first time i take adderall (dextroamphetamine and racemic amphetamine)?

No, I cannot: I cannot tell anyone what they will feel the first time they take anything. However, if your physician has evaluated you carefully, feels you have adhd, and has decided that Adderall (dextroamphetamine and racemic amphetamine) is an appropriate medication for you, then it's very possible you could feel improved concentration and focus when you take the medication. Best wishes.