It is true that you cannot control what life throws at you,in that there are certain things you can't change about you. Take example of your lineage:who your parents are,your blood group etc,your physical appearance in terms of height, beauty,stature etc. But you can shake off the effects and still make the best of your life.
The first step is to sit down and take stock of those things you consider disadvantages,if possible write them out. Face the reality,accept that they are there decide to have an 'inspite of' spirit i.e.inspite of all these,i will still make it.
Focus on the goal and look for those things in you that give you the slightest chance at it. Improve on those strengths,everything you need to live your dream is inherent in you what you need is to discover them and use them.
Snatch your life from fate,dare to dream and work to make them come true,GOD will be wicked to allow you have dreams you can't actualize. That you can dream it is a prove you can live it.