Have you ever had a handful of grocery bags in both hands and simultaneously tried to grab your cellphone from your pocket so as to answer the bleeding thing before it rings off?
If you have, you will know that no matter how you attempt to grab your phone and successfully answer the call, no matter how you try to balance out the weight-to-hand ratio, generally one of the two lands SMACK on the floor. Delightfully so, this in turn results in a never-fun experience of having to chase after your cell, now in pieces, or attend to a glorious egg yolk and shell clean-up.
The analogy is much the same as attempting to chase two rabbits at the same time. IMPOSSIBLE! Unless you know something which you are not telling us in which case I would like to say: WARNING! Messing with vats of toxic waste can be hazardous to your health and insect bites generally bring with them little more than an aggravating rash.
Right, so… we all have more than one dream at a time, but the fundamental crux to the subject of success remains as it has stood for eons: Focus your attention on one thing/dream/project at a time to get the best results.