*huggles* It doesn't invalidate you, You are wonderful and a special snowflake x3 But seriously, For me I felt kind of like this back when I was a bit younger, For me as I got older it just kind of became something I told myself becasue I was scared. So for me at least, It grew becasue I tried to ignore it (or maybe it didn't really grow, but my ability to hide from it shrunk). It's possible you may over time feel differently about everything in your life (That's really just part of life sometimes), however you can't force yourself to do something now if you aren't ready becasue it's possible that you just don't need it.
You say you wish to be a girl, to be feminine, but that it's not that you hate who you currently are to a great extent. That's not unusual really. Are you worried that becasue you feel like it's a desire and not need that you aren't "worthy" enough to try to change who you are? Or are you currently more happy with being who you are that changing isn't really worth the stress to you?
Basically I think it's mostly self contemplating thing, and that regardless of what you are happy with and do, that ultimately it's the right choice as long as you feel it is.