Isn't it all just the same fixation of thought patterns?

No, not really.


I'm of the opinion you can cut a thought off at the root, and overtime modify patterns.


You can with some thought patterns. The thought patterns that cause depression, anxiety, and even schizophrenia respond well to CBT (which is a formalized approach to what you described).

But CBT or any other such approach cannot fundamentally change your personality. You can't think your orientation away and, as Kristofor has mentioned, the failure of the psychiatric and faith based communities in attempting to change homosexuals is proof of that.

Doesn't Jesus instruct us to do this?

No.