The safe approach is to assume that any man you interact with is probably thinking about your boobs or your butt or something similarly sexual. NOT ALL OF THEM ARE (before the men in this thread get upset), but a shockingly high proportion of men you meet out in the world will be thinking about sex. Hell, you don't even have to be a traditionally attractive woman - if you've got boobs, at least one man in the vicinity will be contemplating what it would be like to fondle them.
That's not a suggest to dislike men. On the contrary, I rather like men. But it is a recommendation that you bear in mind that if you make eye contact or smile at a man, there's a reasonable likelihood that he will perceive that as you being interested in him and open to overtures. It's a suggestion to be relatively hands-off and professional rather than casual whenever you meet a man for the first time. Once you get to know someone, you'll probably be better able to gauge their intentions... but even with all of that I've been surprised on more than one occasion when a man I thought was a friend, and who I thought understood completely that we were only friends, made a pass at me.
Your description of yourself leads me to think that you're rather slight of build? If that's the case, bear that in mind. Smaller women, in general, tend to get more determined interest. Many men will be pushier about trying to convince you that you really should want them if you're notably smaller than they are. Taller and stronger women still get the same approach, but men in general don't tend to be quite as insistent when the woman they're after could probably knock them out.
To the men in this conversation - this is a generalization. Obviously, not all men are like this. But it is a reality for most women, because there are far more men who are like that then most women would prefer.
