Usage of the verb immure

According to the online dictionary http://www.thefreedictionary.com, two of the definitions of the verb,

to immure, are

(1) to enclose oneself within or as within walls

(2) to shut oneself away from society

Next, I am going to talk about one of my friends. He wants to take a business program in college, which requires students to take a few math courses. He is not good at math. Some of my other friends and I really want to tutor him free of charge. But, he feels too embarrassed to accept anyone's help.

I am going to make up a sentence about him.

(ex) Our friend immures himself in a situation which prevents him from getting our help.

Am I using the verb correctly? Thanks a lot.