It isn't possible to kill part of your “self” unless you kill yourself first. If you ruin your conscious personality, the so-called ego-personality, you deprive the self of its real goal, namely to become real itself. The goal of life is the realization of the self. If you kill yourself you abolish that will of the self to become real, but it may arrest your personal development inasmuch it is not explained. You ought to realise that suicide is murder, since after suicide there remains a corpse exactly as with any ordinary murder. Only it is yourself that has been killed.