I agree with sad emo. The answer was right under your nose.
When you went out alone and prayed and felt peace, that was your way of worshiping God. And he imparted his peace to you. You can see God in creation and all its beauty. You do not have to join a religious organization that tells you how to and when to worship your creator. The heavens declare his glory and the earth is his footstool. We are surrounded by God and he is in all things and his spirit flows thru all things. I think you were doing it right the first time. Sorry you got sidetracked off your road to peace with God by the Witnesses. It happens to the best of us, it even happened to me.
I was at peace with God, admiring him and his glory in creation since I was 12. But I got duped into following the lie which is you need someone or some organization to tell you what to do in order to be "right" with God. You do not! Like emo said God is a spirit and we worship in spirit and truth. Your simple way of worshiping is something beautiful to God and he fully accepts it as such. Who is man to tell you otherwise?
Many believe it is not that simple but that is also a lie. It is that simple. For God is not partial and accepts any man who is righteous. Righteousness has nothing at all to do with bible knowledge or sticking to a certain moral code. it has to do with your inner heart condition. And your heart is certainly in the right place.
Now, I am not saying that all organized religions are bad. But the majority of them, imo, take people away from the creator and not towards him. They emphasis the organization more than God and that is where the problem lies. I believe organized religion is a product of the Devil and seeks to get us to worship "it" rather than God. But that is for another time. Don't want to steal your thread.
Have you ever tried to be one alone with God like you did before becoming a Witness? Peace, Lilly