What do I want to be when I grow up

How can it be that I am 26 years old and still can't figure it out? I used to laugh at my sister who changed her major 4 times while in college. I have switched mine at least twice as many times. I started off in Pre-Veterinary Medicine; do you know that an Earth Worm has like 300 parts? Yeah, true. When will I ever need to know that? I got frustrated with my Zoology class and bailed. Then it was Business, I was going to be high powered and rich and famous, then I realized I hate business. I am not underhanded enough for it, no offense. So then it was on to computer programming, which I LOVED until I actually had to program. There is a reason those guys get paid well. So then I considered Graphic Arts, but I can't draw. So after a lot of time and A LOT of research I decided to pursue nursing. I took Human Anatomy and Physiology last semester and I LOVED IT! It was the most interesting and exciting thing I have ever learned. I find myself in conversations being a total kill joy, someone complains about something going on with their body and I go into a way too in depth explanation of how that body part works. lol.

Well, the problem is the more research I do into what specialty I want to go into the more restricted I feel. I feel like nursing is only half of what I want. The fields I am interested in are Oncology, Neurology, and Fertility. I am now interested in Fertility, Neurology comes easy to me, and all my family has died of Cancer. Now I can go for a WHNP or WHCNP but I feel like those don't really give me the freedom to do what I want. I want to help people have babies, I want to be there when they finally conceive, I want to do the ultrasounds and I want to be there when they deliver, and neither of those paths allows me to do that. I could be a CNM but I don't feel like I would be the right person for that. I don't want to do home births, or holistic births, and I have nothing against pain killers.

So.. I have been spending the last few days on the student doctor forums. This has only served to depress me more. I have my Fiancé; we are going to be trying to conceive before the end of the year. I feel like going to med school and having a family is not going to work. I keep reading about how you can have a family and go through Med School. You can get Average grades and still have a couple hours on the weekend and maybe an hour a night with your family. I just can't come to terms with that.

Can I be happy with half a career? I know I could not be happy with half a family.