I want to know whether this "i" is affected by karma or not
Yes it is. You are the Atma, the "I", and you are affected by the Karma that you do.
who is the real Doer of all karmas ?
You, the Atma, are the doer of all karmas.
All Hindu scriptures state this. For example, the Manusmriti:
Section: The Responsible Agent: the Self
12.12 - He who is ...
Good question !!
First we need to know basics of "tatva" science. The three eternal elements, Brahman/God, Jiva/atma and Maya. All three are neither created nor destroyed. Brahman, however, can control both Jiva and Maya. The Brahman is the cause of transformation of the material energy, maya, into its gross and subtle components to fulfill the desire of ...
The following is an excerpt from the teachings of Sri Ramana Maharshi.
D.: How shall I reach the Self?
M.: There is no reaching the Self. If the Self were to be reached,
it would mean that the Self is not now and here, but that it should be
got anew. What is got afresh, will also be lost. So it will be
impermanent. What is not permanent is not ...
I know Atman is self aware but I don't know why that Atman lost his self awareness that he is unlimited and beginningless and instead acquiring limited body awareness
I take it you're asking why the Jivatma first entered a body? If so, the answer is that there was never a first time; the Jivatma has eternally been in samsara.
From the Brahma Sutras: