By constant awareness of self identification ( and eliminating things which I'm not) , I have started losing I-ness.
The above sounds like the practise of Hindu meditation (rather than Buddhist Anapanasati).
Losing "I-ness" but not completely is not difficult to explain. It is easy to explain. It is precisely the "death" ("marana") of "the entity" ("jati") the Buddha explained in Dependent Origination .
Although this "death" ("marana") of "the entity" ("satta-jati") is giving a initial sense of some peace and thoughtlessness, you ("the entity") is not committed to Nibbana and you ("the entity") is not ready to "cease" ("nirodha"). You ("the entity") is not practising to end suffering but sound like you are playing games with meditation.
What you should do in this situation is to stop fondling (playing) with meditation, be it Buddhist meditatormeditation or Hindu meditation, and return to ordinary worldly life. The Buddha did not teach anatta (not-self) meditation to worldlings.
The Buddha explained this situation in the following sutta:
On one occasion the Blessed One was dwelling at Kosambī on the bank of the river Ganges. The Blessed One saw a great log being carried along by the current of the river Ganges and he addressed the bhikkhus thus: “Do you see, bhikkhus, that great log being carried along by the current of the river Ganges?”
"If, bhikkhus, that log does not veer towards the near shore, does not veer towards the far shore, does not sink in mid-stream, does not get cast up on high ground, does not get caught by human beings, does not get caught by nonhuman beings, does not get caught in a whirlpool, and does not become inwardly rotten, it will slant, slope, and incline towards the ocean. For what reason? Because the current of the river Ganges slants, slopes, and inclines towards the ocean.
“So too, bhikkhus, if you do not veer towards the near shore, do not veer towards the far shore, do not sink in mid-stream, do not get cast up on high ground, do not get caught by human beings, do not get caught by nonhuman beings, do not get caught in a whirlpool, and do not become inwardly rotten, you will slant, slope, and incline towards Nibbāna. For what reason? Because right view slants, slopes, and inclines towards Nibbāna.”
‘Sinking in mid-stream’: this is a designation for delight and lust. ‘Getting cast up on high ground’: this is a designation for the conceit ‘I am.’
‘Getting caught in a whirlpool’: this, bhikkhu, is a designation for the five cords of sensual pleasure.