I had the same issues originally, then again I was trying mostly tobacco flavors. Menthol seemed to be the only thing I could stand but the Menthol I got was a pure menthol and was too strong. I was about to give up but them my wife ended up ordering some strawberry juice. Which I also didn't really care for at first. Then I had the idea of mixing strawberry and the menthol (2:1 Strawberry:Menthol) and that has now become my all day every day vape. I do usually have to order a few extra shots of the strawberry flavor in that juice and leave the menthol as is.
My suggestion is to stay away from tobacco flavors and pick a fruity flavor and try mixing it with menthol. If you don't like menthol there are also some wintergreen, peppermint, and spearmint type flavors that may also work well with fruity flavors. Kind of like vaping a fruity breath mint.