Like a handshake or a high-five. I heard before that its not allowed I just wanted to confirm it.
In the name of Allah, the compassionate, the merciful
In regard to your question as you asked:
Am i allowed to shake hands with my female friends?
The response of your inquiry would be NO. In truth, shaking hand is considered as a haram practice from the viewpoint and actually order of Islam. (Based on Shia view, although I assume the view of Sunni would be like that as well). Therefore you are not allowed to shake hand with your female friends, since they could be considered as non-mahram. Of course to the best of my knowledge, there are several reasons for it (as an impermissible act), but I suggest you to read the following source which has provided in Arabic, Turkish and Farsi (Persian) languages.
And God knows best
If you are really sincere about following Shariah Law, then, it's a good question. I am to say that It is forbidden because the female is ghaire-mahram (non-mahram), right? There is a hadith regarding situation like this.
Ibn 'Umar (Radhiallaahu Ta'ala anhu) narrated:
" 'Umar delivered a Khutbah to us at Al-Jabiyah. He said: 'O you people! Indeed I have stood among you as the Messenger of Allah(s.a.w) stood among us, and he said: "I order you (to stick to) my Companions, then those who come after them, then those who come after them. Then lying will spread until a man will take an oath when no oath was sought from him, and a witness will testify when his testimony was not sought. Behold! A man is not alone with a woman but the third of them is Ash-Shaitan. Adhere to the Jama'ah, beware of separation, for indeed Ash-Shaitan is with one, and he is further away from two. Whoever wants the best place in Paradise, then let him stick to the Jama'ah. Whoever rejoices with his good deeds and grieves over his evil deeds, then that is the believer among you.'"
Jami` at-Tirmidhi 2165
By the way, non-mahrams are those with whom you are allowed to marry.
And Mahrams are those with whom you aren't allowed to marry. Mahram On Wiki