I always thought the thesis of the essay belongs towards the end of the introduction paragraph but the other day my teacher said it's suppose to be it's own paragraph. Can anybody clear this up for me.

I'd put it wherever your teacher tells you to, but in the usual short academic essay, it is part of the introduction, which may run for a paragraph or two. The thesis can be in its own paragraph, but there is no requirement for that layout. Much depends of course on the length and complexity of the essay-- in a long work, there may be several introductory paragraphs of background on the topic before the writer's thesis is presented.
yea its true, the thesis of the essay should be in the last sentence of the introdunction paragraph....but my friend's teacher told to put a thesis in each paragraph in one essay..can it happen
The thesis for a body paragraph is called the topic sentence. Each body paragraph must have a topic sentence that states what that particular paragraph will be about.