我是谁？ ................................. please correct me，in English ! :)

你好，我叫穆罕默德 ， 你呢？ 我学习(的专业是)机械工程， 我是一个二十岁男孩子。 我的汉语不是很好， 我能说阿拉伯语， 英国 （英语）， 法语 和 没很多（一点点） 汉语 。我有一个美（漂亮的）女朋友 感谢 阿拉 :) 她教 爱情， 去 是 强， 去 有 希望 （她教会我知道什么是爱情，怎样更加坚强，并要怀抱希望）

In Chinese, a simple statement also can have six parts, subject, predicate, object, attribute， adverbial modifer and complement.

1、If you want to say "My majority is mechanical porject", your empasis is "mechanical project", you can tranlate it directly --"我的专业是机械工程". If you want to express what I have been doing now, you can say “我在某大学学习机械工程”。

2、Although either "英国" or "英语" is the same English word, but they are different in Chinese. You did well in "阿拉伯语、法语".

3、"我是一个二十岁的男孩子。" It is a very lovely expression, and is fit for your age. But if you tell it in formal situation, for example, you introduce yourself for someone, you can say "我今年二十岁", if it is a written statment, you can write "穆罕穆德， 男，二十岁" .

3、We usually call a beautiful girl "美女", but when we describ a girl, especially it is an attribute, we usually use "漂亮", for example, "那个女孩好漂亮。","她真是个漂亮的女孩。"

4、The same with English, we can say I cannot speak much Chinese, or you can say I can speak a little Chinese. In Chinese, you can say it in positive way--"我会一点儿汉语。", and you can say it in negative sentence --"我会说的汉语不太多。"

5、"She taught me love , how to be strong , and hope". It is a little difficult to express your opinion and emotion accurately. Basically, it must has subjet, predicte and object. love is "爱情", strong is “坚强” and hope is "希望", which verb you should use depends on what you want to say,for instance, what is love, how to operate love, how to concern people around you, and so on

I think honest is basic. Every person is a set. They will mix when they have the same interest, the common subject,and so on. When they usually get along with each other, help each other,  emotion will bring up among them.

You must have courage. It will make you more confidence. Facing the trouble, you can remain smile. Having solved the problems, you can feel real happiness. If you fall, you can keep on enjoying your life as well.