Is it possible for me to borrow money from my American bank if my credit rating is on a medium rating?

Probably, although you won't have an ideal rate.

Your rate will be even worse because it's basically an unsecured loan - there's no collateral. It's better to save for than to finance a trip. If the money were for an auto, a house - something with a tangible value - or for which there was a guarantor - ie, the U.S. govt for an education loan - that's a different story. But your medium credit rating and the non-collateralized non-productive nature of your loan makes it a high risk.

You can get the loan, at a high interest rate no doubt and I don't suggest you tell them that you need it for travel. Put up a collateral and tell them you are using it for home remodeling or for business.

Most banks actually will loan you the money, however they will charge you a higher interest rate!

Its posible, but you would get a high intrest rate. The worse the rating, the higher intrest rate, and harder it will be for you to get a loan.