How did you work out that you had a tailwind of 15kts...?
The wind is 285 at 15... Westerly wind.
You are going 026 degrees i.e. North.
Therefore you have a crosswind.... Recalculate your wind vectors, and find your heading, using whatever Gizmo you have.
If you want to be old school, you could use pencil and paper, and draw the vectors geometrically to scale. 1 inch to 20 kts.