I saw your other posts about your background and interest in the Russian language. The 1990s was a tough decade in Russia and probably you've had a more stable upbringing in the United States than you would have had if you had remained at the orphanage. Try to see the good points. As for English, well it's a language that billions around the world struggle very hard to master. Do not dismiss it..
Frankly, putting on a "fake" Russian accent when speaking English strikes me as a bad idea for many reasons. People who met you for the first time would feel like you were trying to decieve them, since your English is, in fact, native. My advice to you would be not to do this.
Why don't you start learning Russian instead? That way when you are older you can visit the town you were born in and investigate your background, or even pop in at the orphanage! Many people here would be happy to help you with leaning about Russian language and culture. Although you could not be counted as a native speaker (anymore), you might find that some memories of Russian are hidden at the back of your head, and that you can progress faster than other learners.
I got the impression that perhaps you have some emotional issues relating to the fact that you were adopted. The best place to discuss this is a forum for adoptees -
I think there are some great adoption forums in "Yahoo Groups" for instance. People on this forum won't quite know what to say since they are not adopted themselves, and since the focus here is Russian language and culture. You are not alone and there might be others there who are also adopted from Russia.