Can I really do this?? This is what I wanted so why I am so NERVOUS NOW??

HI all! I have been hiding in the forums for quite some time. I am 35 y/o mother of four who has spent the last year working on prereqs and am now in the last stages of getting into the program. I have maintained good grades, and have taken literally every prereq and even all the other extra classes for my degree that I can take. I Have started my 6 month HEP series, gotten CPR certified, YOU NAME it, I have done it to prepare for the program. I LOVE medical things especially L&D! I work in PBX at a hospital to help me through school. I have a couple of questions. I take my TEAS/NET test (I am applying to two different schools) in July and August. All I have to do is pass the test which I feel extremely confident about. Now that I am so close to my dream, I feel myself extremely nervous, almost like second guessing myself? Like I keep thinking, OMG what if I CANT do this? I mean my LORD I am one of those that used to be terrified of needles as a kid and even as a teen! Will I get over this anxiety and is it normal or am I just weird LOL?? I am SO excited to be this close, but I kinda feel like when you decide to ride this huge roller coaster because everyone says its so fun, and it LOOKS fun, but then when you get on it and it begins to clink clink clink up the track, you begin to think WHAT HAVE I DONE, can I GET OFF NOW?? Of course at the end of the ride, your completely thrilled ) Also, any of you that are already nurses, did any of you get sick or faint when it came time to learn IV's and such? I just want to do good and learn everything I need to learn to be a good nurse!!