Why do I have trouble being 'just friends' with boys?

For some reason I'm really bad at having platonic friendships with guys. For starters, when I meet a guy I like, I usually want to date him, and if I meet a guy I like but don't want to date him I would ask him out for coffee but don't out of fear he'll ume I'm interested romantically. If I so much as say the word coffee guys make all kinds of umptions. And it's kind of awkward to ask someone to hang out and be all like, 'I just want to be friends, I'm not interested in dating you right now.' For this reason, I end up either dating a guy or not seeing him at all. But I want to be able to develop friendships with guys because it's good to get to know people in a non romantic context, without all that pressure. How do I show guys that I want to spend time with them as friends but not have them ume I want to date them?