Mindset for Delta Force?

since I was six I've wanted to be in the Delta Force(16 now) and I'm going to basic next year over the summer and am pretty sure physically that I can make it into Delta Force. I also am on the ROTC marksmanship team and have reached expert but when it comes to mentality is there something that I'll need or not need. I know probably none of you can acurately answer this but when I see pictures of presumably Delta Operators it pisses me off at the way they look because I don't look like them and another question is, is airborne or rangers satisfying because I plan to get into both but I might stop there