Just try and relax. Speaking a foreign language at the beginning can be a daunting experience, but remember we are all here to help you and want you to succeed. No one is going to judge you. You'll be surprised with how much English you actually know once you relax and are no longer afraid to make mistakes.

you learn a lot more from making mistakes than speaking it correctly.

After you speak for awhile you will feel more comfortable. But the first person that doesn't understand you will throw you off and make you nervous again. I was told to just speak slowly then the words are easier for you to say and for the person to understand.

When I first moved to Germany 6 years ago I was also a little timid over trying to speak their language to them... but then I realised something, my German was far, far better than their English. I am quite sure your English is far better than the majority of English speakers Arabic. Feel proud and confident.