Your verses and what is actually in scripture are two different things:
1Co 14:2 For one who speaks in a tongue speaks not to men but to God; for no one understands him, but he utters mysteries in the Spirit.
The idea that Paul is speaking of a private prayer language in the chapter is contradictory to the fact that Paul is correcting tongues in the worship service.
1Co 14:9 So with yourselves, if with your tongue you utter speech that is not intelligible, how will anyone know what is said? For you will be speaking into the air.
In other words gibberish
1Co 14:13 Therefore, one who speaks in a tongue should pray that he may interpret.
This verse is designed to show that the faculty of speaking intelligibly, and to the edification of the church, is of more value than the power of speaking a foreign language. The reason is, that however valuable may be the endowment in itself, and however important the truth which he may utter, yet it is as if he spoke to God only. No one could understand him.
1Co 14:14 For if I pray in a tongue, my spirit prays but my mind is unfruitful.
1Co 14:15 What am I to do? I will pray with my spirit, but I will pray with my mind also; I will sing praise with my spirit, but I will sing with my mind also.
In other words I will speak intelligent things rather than gibberish.
1Co 14:16 Otherwise, if you give thanks with your spirit, how can anyone in the position of an outsider say "Amen" to your thanksgiving when he does not know what you are saying?
In other words "he does not know what you are saying" pretty self explanatory.
1Co 14:17 For you may be giving thanks well enough, but the other person is not being built up.
Paul was being kind here to their intent but it does not mean he agreed with it. In fact the context of the passage is otherwise.
not being built up.
1Co 14:18 I thank God that I speak in tongues more than all of you.
Paul spoke a number of other known languages. He was very educated.
1Co 14:26 What then, brothers? When you come together, each one has a hymn, a lesson, a revelation, a tongue, or an interpretation. Let all things be done for building up.
So you believe Paul is speaking of a heavenly tongue here and you believe he is saying that everyone in this church speaks in tongues?
1Co 14:28 But if there is no one to interpret, let each of them keep silent in church and speak to himself and to God.
If there be none present who can give the proper sense of this Hebrew reading and speaking, then let him keep silence, and not occupy the time of the Church, by speaking in a language which only himself can understand.
1Co 14:39 So, my brothers, earnestly desire to prophesy, and do not forbid speaking in tongues.
Do not suppose that the power of speaking foreign languages is useless, or is to be despised, or that it is to be prohibited. “In its own place” it is a valuable endowment; and on proper occasions the talent should be exercised; see in 1Co_14:22.