Post History

It looks like you will have uplift, frequent earthquakes, and volcanos in the lower part of your island where three plates are jamming together.

In the northern part, the plates are spreading.  You'd need volcanic activity to explain mountains there, or even the island existing at all.  This would be similar to Iceland, for example.

Note that islands don't require being on plate boundaries.  They can exist for various other reasons, like being on a piece of a plate that broke off, what's left of an old mountain range, moving over a hotspot (like the Hawaiian islands), etc.