smartteen:
With no offense to the other posters, I don’t think the standard advice for improving kavana will be helpful in your situation. Do you?
I think you need to deal with the reason why you don’t want to daven. You say that for many years you were in a hard situation and you felt as if G-d was not responding to you, and you do not want to daven anymore because of that.
I find that very reasonable. If you feel that G-d abandoned you when you needed and relied on him, why should you want to extend yourself again to be shot down? (Please nobody respond how smartteen shouldn’t feel this way. smartteen needs to deal with how smartteen feels, not with how smartteen should feel.)
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Have these feelings extended to the rest of your avodas hashem also? If so, it certainly is not a problem with davening. Rather, davening is just a manifestation of your general feelings.
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You haven’t told us what the difficult situation was. If it was tension with or between your parents, it is quite normal for that to affect your relationship with G-d and with Judaism. If it was anything else, it still is quite normal, especially since difficulties often do affect the family dynamic.
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I wish you much luck. If you really do feel significantly disconnected with G-d and Judaism, you should find someone you can talk to about that.