  Two decades after its unexpected discovery, the properties of the $X(3872)$
exotic resonance are still under intense scrutiny. In particular, there are
doubts about its nature as an ensemble of mesons or having any other internal
structure. We use a Diffusion Monte Carlo method to solve the many-body
Schr\"odinger equation that describes this state as a $c \bar c n \bar n$
($n=u$ or $d$ quark) system. This approach accounts for multi-particle
correlations in physical observables avoiding the usual quark-clustering
assumed in other theoretical techniques. The most general and accepted pairwise
Coulomb$\,+\,$linear-confining$\,+\,$hyperfine spin-spin interaction, with
parameters obtained by a simultaneous fit of around 100 masses of mesons and
baryons, is used. The $X(3872)$ contains light quarks whose masses are given by
the mechanism responsible of the dynamical breaking of chiral symmetry. The
same mechanisms gives rise to Goldstone-boson exchange interactions between
quarks that have been fixed in the last 10-20 years reproducing hadron,
hadron-hadron and multiquark phenomenology. It appears that a meson-meson
molecular configuration is preferred but, contrary to the usual assumption of
$D^0\bar{D}^{\ast0}$ molecule for the $X(3872)$, our formalism produces $\omega
J/\psi$ and $\rho J/\psi$ clusters as the most stable ones, which could explain
in a natural way all the observed features of the $X(3872)$.
