Please help

I really like this guy who is my friend. I can’t even bring myself to try to flirt or try to make something of this bc after I hang out with him ( he is in my lab group) and we hung out once. I get really sad and think I’m not good enough or he doesn’t like me like that or I have some issues and he wouldn’t want to put up with that. Just basically coming up with 1 million reasons why it wouldn’t work. Also he isn’t doing things with me that he said he has done with girls he likes for example he said he gets really nervous around girls he likes and gets stupid and butterflies and he said he flirts with a girl he might have a crush on and he doesn’t flirt with me so I don’t even think he likes me like that. But even if he did I just think of a million reasons why it wouldn’t work. Anyone have any advice for me? Any at all, tell me what you think good or bad. Thanks in advance!