I once had an evil spirit pretending to be the Holy Spirit who tried to get me to speak in false tongues. I recognized it as an evil spirit, because this thing was a serpent rising from my stomach up into my throat and took over my mouth. I stopped it right after it started, so I can't give you any more details.
I've never spoken in real tongues, but I do know what the Holy Spirit feels like, and it's definitely not like that.
I do believe I may have thought in tongues once, but after that experience I'm a little taken back. There are too many false experiences out there. But if God wants to, I'll happily speak in real tongues one day.
Be careful everyone!
From your description, it certainly sounds to me like a counterfeit! The fruit of the Spirit is love, joy, peace, gentleness, etc. If a manifestation does not have those attributes, I would reject it without hesitation. You never know what might jump into you and cause you to need deliverance later. There is the experience of a guy who had a prophecy over him which did not relate to anything, so he put it on the back burner. Then he experienced serious back pain, and had two unsuccessful operations until it was revealed to him that he had received a spirit of divination attached to the false prophecy. As soon as he renounced the prophecy, the back pain disappeared and never came back.
Usually, a false manifestation such as tongues will happen if the person is pressured into it, or tried to do it in the flesh because he thinks it is the thing to do. There is a set of faith steps to receive a genuine gift from God.
1. You have to know for sure that the gift is God's will for you. "Do all speak in tongues?" Paul asked, implied that not all people receive that facility.
2. You need to ask for the gift. "Everything by prayer and supplication make your requests known to God."
3. You need to accept it by faith. "He who asks, receives." "If we ask for anything according to the will of God (see my point 1), he will receive it."
Then, you can take the step of faith and speak in a language you never learned, but it usually is not accompanied by any bodily or sensual experience. If one looks for sensual experience, the devil is always there to give them one.
When people approach the gifts of God in this faith way, then people are not going to be forced into something that may be a counterfeit. The Scripture says, "If a son asks for fish, would a good father give him a snake? If the son asks for bread, would he give him a stone? So if a human father would give his son what he asks for, wouldn't our heavenly Father do the same?" So, if we approach the Lord using the Scriptural steps of faith for asking and receiving, would the Lord allow us to receive a counterfeit. I really don't think so.
Oh, by the way, if some type of force tries to take over your mouth, lips and tongue, reject it immediately because it is false. Faith is you voluntarily doing something you couldn't do before, on the basis of the steps of faith that you took. We do the speaking, not some spirit forcing us to speak.