I always find it odd that a person can come to the US prepared for a short visit, yet suddenly decide to give up everything in home country without the possibility of returning to tie up loose ends for up to 9 or 10 months. Seems it would be really stressful.
Correct. But the OP never said that the situation changed. He said he entered as a visitor and he wants to stay. It is an open question as to whether this was his intent. The OP, now, has the opportunity to clarify.
Congratulations...Next stop is citizenship...N-400s don't typically take long...USCIS is still up to their tricks of skewing I-751 processing times by processing some I-751 immediately while others have to wait several years even with no RFEs.