I just cut my self with a rusted metal , can I get any disease ? For example an std like hiv ?

"STD" stands for "sexually transmitted disease" so you are not going to get any such thing from rusted metal unless you are doing some very very kinky stuff, in which case the STD is probably not you biggest problem.

In any case, the rust has nothing to do with it. Clean the wound with hydrogen peroxide or some other antiseptic. To prevent scarring, get "Pure Vitamin E Skin Beauty Oil" at the cosmetics counter. Be sure it says "Pure". You can also use capsules by poking a hole with a pin and squeezing the oil out. Vitamin E has to soak in, so put it on when you can leave the skin bare for a while.

Read a book now and then so you know stuff like that.