Thus this mean that it is designed to be limited or someone is limiting bitcoins so as to make its value higher than the actual dollar or money??? Do you admit that someone is controlling its flow or hoarding btc so as to make it rare?
The code and protocol, as designed, put a hard limit of around 21M bitcoins total.
What happens then to lost btc?
This guy has an effin' good point; what happens if rich BTC users die and their Bitcoins are lost forever? I never thought about that, but surely somebody else did?
remaining bitcoin raise in price. what happens if i put a ton of gold on the bottom of ocean -> less gold in the world -> higher price.
Cool, say if there's only 1btc left? or 000000000000000000000000000000.1 left ?

You would presumably increase divisibility and price would balance things out. Practically, that won't happen. As people figure out how Bitcoin works, they won't let their bitcoin go with them when they die.
Presumably it happens, let's say, someone holds / hoards bitcoins til a point where its value is 1btc= $1M then i have kept or hid at least 10btc then i could be an instant millionaire? Then as what you have mentioned that there were 21M btc's, if someone kept/hids/hoards at least 50% out of it, WOW, then LET US ALL HID OUR BITCOIN TILL IT BECOMES RARE AS DIAMOND then we all become millionaires.
1. You wouldn't have become a millionaire instantly. It would have happened slowly over time.
2. if everyone hoards their bitcoins that means no one is trading with them or buying and selling them. This would make them worthless.