Oh come on, why would I be mad at you? You didn't say anything that would justify so much as a frown. Also please don't think that disagreeing with my point of view would make me angry or something. It would be a dreadfully boring discussion if everyone just agreed with everything everyone said. Sometimes I'm afraid people think of me as somewhat scary, but really I'm not.
 

I'm sorry, but typing of the whole book is not something that can be done without a great investment of time, something which you woefully lack during university studies. Rest assured though that I quoted the passages of relevance to the discussion about Littlefoot's motives to get rid of the Sharptooth to the letter.
The book is frequently offered at ebay so it won't be more difficult for anyone else to buy than it was for me (I don't live in the US and I am no native English speaker myself).

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I honestly thought Littlefoot wanted to prove to himself that he could survive without the help of any adults, especially since he went through the whole movie without his mother. I mainly thought of this because after the encounter when Littlefoot sees his mom in the clouds he becomes sad and explains how he tried to do what she told him.

Not sure on that one. There are a few moments in which Littlefoot really seems to think remotely along the lines of being "the lone dinosaur" who can do it all by himself. But I am not sure that these moments were mainly inspired by his desire to prove anything to himself.
There is the moment in which he blocks Ducky's first attempts to make friends with him. But his behavior in that scene is clearly inspired by Cera's behavior in the preceding scene and possibly by what his mother told him about longnecks sticking to the own kind. I don't see any indication that "doing it all by himself" was a motive for Littlefoot in that scene. On the contrary, his behavior towards Ducky changed right away after she mentioned that she is all alone.
We see Littlefoot looking very disappointed and sad when the others huddle to Cera rather than to him during the night in the little valley. There was nothing about him suggesting any "I can do it by myself! who needs them anyway?" - kind of conduct.
Another scene of Littlefoot going of all by himself is after the quarrel with Cera. But he didn't really mean to be on his own. As he had to follow the way his mother had described to him he had little choice but to go on alone as the others wouldn't follow him (and he was to upset about the quarrel with Cera to make a real effort to convince them of his way).
I don't think that Littlefoot felt he had to prove anything by getting rid of the Sharptooth without the assistance of a grownup.

I'm going to throw my two cents in and say that I can't sort out Anndi McAfee's voice anywhere in this version. I've closely listened to this, and I can sort out what may indeed be Littlefoot's voice (thus the Thomas Dekker comment Malte made). However, the voice at the beginning doesn't sound like Littlefoot or Cera. Is it possible all three of them are doing this?

And I needn't say that Ducky's voice sticks out like a sore thumb.