Help with 3 sentences

Hello,
I'm writing my motivation letter and I am a little uncertain about some sentences. Not sure are my sentence structures correct and do I use commas correctly.

Here are the sentences:

"I would not consider myself as a very technical person but with the help of usability know-how, high technology applications can be improved."

"My main interest is usability study; I like its humane nature and the fact that usability really makes a difference for the end-users."

"Thus I believe that if I do my master's thesis in co-ordination with you, it will benefit both sides."

So are these sentences written correctly?
Thanks in advance.