Hello SPECTRE1,
Nicely articulated post. What you are asking is not really a question that plays one into another.
More likely, you can associate those who are motivated enough to do something that is difficult (and do it well) as being successful in doing other things that are also difficult - and doing THEM well.
The Rangers are part of SOF, but they do different things than Army Special Forces. Additionally, if the Rangers and Special Forces were both tasked to do the same thing, they would go about it very differently.
There is an old joke about Rangers and SF being ordered to take a hill....
The Rangers gathered their Battalion, planned their operation, laid on additional firepower, ran battle drills non-stop for 72 hours, refused to eat, did additional physical training and honed their marksmanship capabilities. Then they charged and secured the objective with 100% enemy killed and minimal friendlies wounded.
On a neighboring hill, a Special Forces A-Team was tasked with taking another hill...they went to their hooch, lit up cigars, drank some local hooch with the indig chief, and called up the Ranger BN. Mission still accomplished, just in a different way
Focus on your 25 meter target, enjoy cheerleaders, do well in school, keep yourself physically fit, remain mentally straight, and enjoy the experiences of learning to be a Soldier when the time comes.
THEN, learn to be an expert infantryman as a successful Soldier in the Rangers / Infantry / whatever you so choose. You may enjoy that lifestyle and mission profile. Should you find yourself wanting something different, then Special Forces may be an option for you to explore.
Bottom line, it isn't the unit you came from that makes you an exceptional choice for Special Operations, rather it is much the opposite...simply stated, Special Operations is made up of exceptional men who happen to be Soldiers.
HTH
Eagle