Mesh Collider for Voxels

Hey i did some Code for Voxels. Now i have a problem. I want to move a player in the world. The easiest way would be to use a mesh collider but i think that uses too much resources. So i have to write some own code for collision with the player. But am i right when i think i have to wright an own raycast function for interaction and stuff too? Or can i use Mesh Collider? I have Chunks with 24576 vertices (16*16*16*6). Ammount of triangles depends very much on the landscape.