英语高手来帮我看下这段话有没有语法错误~

Actually, at first, I liked him. At that time I thougt he was so much different from the other presidents of America. I believed he would make the change and bring the change to America, and even to all over the world. But now, I think people are disappointed by him to some degree. People haven’t seen that difference he mentioned in his speech.
But what I learnt from Abama is daring to challenge and trusting myself.
总体写得非常好，我尊重你写的，只是做了一些时态上的改正。

取消括弧内的字

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Actually, at first, I liked (like) him. At that time I thought (thougt) he was (is) so much different from the other presidents of America. I believed he would make the change and take the change to America, even to all over the world. But now, I think people are disappointed in (by) him to (at) some degree. People haven〉t seen those differences (that difference) he said in his speech(1).
But what I have learnt (learnt) from Obama (abama) is daring to take challenges
(challenge) and trusting myself.

(1) 不是错误,但可考虑用 he promised 来代替 he said in his speech
如果要有 speech,可加上补充资料,例如竞选运动时的演说,就职时的演说
甚至将speech改为众数

看看括号里的

Actually, at first, I like（ed） him. At that time I thougt he is（was） so much（删除much） different from the（删除the） other presidents of America. I believed he would make the change and take(bring) the change to America, even to all over（删除all over） the world. But now, I think people are disappointed by him at(to) some degree. People haven’t seen that difference he said in his speech.

But what I learnt from abama is daring to challenge and trusting myself.（But What I've learnt from Obama is self-confidence and daring to challenge.）

写的很好呐，看了四五遍没看出语法有何不妥的，挺厉害的水平 ~~
三楼的吹毛求疵了~~