What makes me wonder is, all of the fussion process are exothermic?, and the fission ones are endothermics (I dont see how, but is this the case)?
First of all, the first type of fission to be technologically achieved was exothermic fission. Nuclear reactors use exothermic fission to generate power. However, examples of endothermic fission exist, as well as endothermic fusion.
All elements heaver than Iron are thought to have been produced by stepwise endothermic fusion reactions in supernovas (exothermic fusion ends with the element Iron). https://en.wikipedia.org/wiki/Nuclear_fusion.
Meanwhile, fission of Lithium-7 into Helium-4 and Hydrogen-3 by a high-energy neutron is an example of an endothermic fission reaction https://en.wikipedia.org/wiki/Tritium#Lithium. It is used in thermonuclear weapons to breed significant quantities of the rare Tritium isotope needed for the highly exothermic deuterium-tritium fusion reaction that supplies most of the weapon's power.