that is enough to seriously impact YOU. there is lots of debate and differing theories about what affects our sexual identities - but events like you described are more than enough to cause emotional and psychological complications - if not all-out trauma. you sound like you feel the need to explore this further - it is worth the effort to try to understand more clearly. i'd suggest reading some of the reccommended books and articles on the home page and seeing a qualified therappist.
and of couse - chatting with others on the MS forums is often helpful, too.
There’s a special providence in the fall of a sparrow. If it be now, ’tis not to come. If it be not to come, it will be now. If it be not now, yet it will come—the readiness is all. - Hamlet, Act 5, sc 2