I don't see an important difference between being thankful and feeling glad. When my other pup died this year, what I felt most strongly was how glad I was to have known him and glad that we had the relationship that we did.
"I feel fortunate that ..."
"I feel lucky that ... "
"I feel thankful that ..."
"I feel glad that ..."
If there's an important difference here it is getting away from me.
"I feel fortunate that ..."
"I feel lucky that ... "
"I feel thankful that ..."
"I feel glad that ..."
If there's an important difference here it is getting away from me.