Check out the SALT platform, they are the leaders in this field: https://www.saltlending.com/

Below are a couple articles regarding their platform:

https://medium.com/trivial-co/lending-and-borrowing-on-the-blockchain-should-banks-be-scared-e0a01c857c43

https://medium.com/cryptocurrency-citizen/blockchain-review-salt-lending-win-win-loans-f96f64a37d91

Like anything else, don't get into any sort of contractual agreement without understanding the fine print, do your research.

Hope this helps!

If you're willing to give 120% worth (in USD) of your Bitcoins as a collateral, then I think yes, there are many out there in the lending section - https://bitcointalk.org/index.php?board=65.0
where you can get all your requirements met. As well, there are many trustworthy lenders here but you may face somewhat high % in terms of interest. It also depends on the way you want to receive that USD amount. Well, if you'd just open a thread in that lending area, maybe you could get a lot of offers to choose from. The thing here is, the value of Bitcoins is very volatile and as you're aware of the fact, if the value strips down to more 10%, the lender has the right to liquidate it (though, many of them will ask you to repay if you can, at that time when bitcoin goes too much volatile).

I did it once but my reason is the transaction of my bitcoin withdrawal takes about a couple of days,
And I really need some money at that time so I did borrow some money from my friends and paid them when I got my BTC ,
But as long as I have a BTC or any coin that I could sell I and I could have it instantly I wouldn't borrow some money.

This is totally the opposite what you have written in your post.
OP talks about getting a USD loan and the collateral would be his existing bitcoins, so it's not about getting a loan and buying bitcoins because he already owns the bitcoins.

Thanks! haha

Sure there are organizations like that but I'm not sure that I'm ready to do that for now. I don't really know the arrangements involved but I will try and find out more about the benefits and the risk involved.

Do you mean using Bitcoin as a collateral for a loan? That is too risky for lenders because the price is too volatile. The lender might ask for a condition that when price suddenly drop below $6,000 USD they will liquidate to make sure they recover their capital. You can also see this as a condition in the lending section where lenders asks for alt coins as collateral but will sell rightaway when price drops.

Taking a loan to invest in bitcoin is not something I will recommend to a friend.  For one, loans have interest and since bitcoin price is so volatile, you will not be able to definitely predict the outcome of your investment.  

i am willing to bet that what you call "organizations" are a bunch of scammers with a pretty website. because if you think about it no real business is going to accept a highly volatile asset as a collateral for a loan.

imagine you take a loan when price was $20k so you pay 1BTC as collateral and receive a little less than $20k. then price falls to $6k. do you think anyone in their right minds are going to pay back $20k to receive 1BTC or simple default the loan and go buy 3.33BTC instead?
now imagine a couple of borrowers do this. the "organization" is bankrupt in less than 3 months.