Starise
Basically if you learned fiddle, you need to go back and re learn everything the right way .
Or if you learned violin you need to g back and re-learn everything the right way :-)
It depends on what you want to play really. Though there's a strong argument that the traditional fiddle styles of Britain/Ireland/Scandinavia and the US fiddle styles that are based on those are a direct descendant of the way the violin was played in the Baroque era with a short bow stroke, emphasis on rhythm, the use of drones and double-stops and minimal vibrato.
The warm, slow attack, soupy, warbly vibrato style coming along later and being given a big boost by the popularity of Fritz Kreisler in the early 20th century.