Is Messiah, the Son of God, also is God Himself?

Psalm 2 - talks about the Messiah. The Psalm is mostly written by David, King of Israel and other contributors. However, there are verses, like the one below, that is written as if God Himself is talking and here it is talking about His Son Yshua.

7 “I will declare the decree:
The Lord has said to Me,
‘You are My Son,
Today I have begotten You.
8 Ask of Me, and I will give You
The nations for Your inheritance,
And the ends of the earth for Your possession.
9 You shall break[a] them with a rod of iron;
You shall dash them to pieces like a potter’s vessel.’”

But why do we say His Son, Yshua, is also God. To call anyone else God, apart from the Almighty God is blasphemy - God made this clear in "Thou shalt worship no other gods". This also means we cannot worship anyone else except God. But then verses like the ones below shows God Himself declaring that the Son has all authority (lest He be angry) and deserving of our worship (Kiss the Son). God does not share His worship with anyone else, hence the conclusion is the Yshua, the Son, is also God.

11 Serve the Lord with fear,
And rejoice with trembling.
12  Kiss the Son,[b] lest [c] He be angry,
And you perish in the way,