Will eating fast food everyday cause me to lose energy?

I have eaten fast food almost everyday for a while. I do not eat a lot though, just small portions to “fill me up” (three tacos, a fries and a burger). I even go for “healthier” fast food choices such as pollo tropical. I am not gaining weight at all since I just do not eat enough of it to gain any weight. I would classify my diet as “bellow average” but I just do not eat a lot in general.

Is this bad for me? Is this probably causing me to lose energy.