Using Tessa's expression, I think that more than subtle hints, they were 2x4's:
- always far more comfortable in female company than in the company of guys
- noticeably more sensitive than my brothers and other male peers
- from a very early age, an attraction for "typical" female activities such as cooking and housekeeping earning me a reputation for being excellent potential "wife" material (if certain details were overlooked..

)
- regular crossdressing from adolescence onwards
- quite severe anorexia as an adolescent
- a very late puberty which may have been a result of the anorexia but, with hindsight, clearly some hormonal issues
- fantasizing about being the woman in sexual situations
- in spite of being very athletic, never wanting to put on muscle
- using skin care products at a time when it was a very, very unmanly thing to do (my ex-wife used to tease me a lot about that..)
- being told by everyone that "I throw like a girl". Still true to this day...
However, when I was young, the very notion of being TG was just not on the radar so even if I was asking myself some serious questions by the time I hit my early twenties, for a long time I found no answers. The fact that I was and still am mostly attracted to women no doubt created some confusion too.