How can I find out if he likes me?

I'd say he definitely likes you. Lots of young guys are absolutely terrified of approaching girls, especially when there are other people about. Try to find a way of getting him somewhere alone with you if you can. Then YOU do the talking. Push the situation along a bit by suggesting the two of you do something together. You could do yourself (and him) a big favour.

Well first see if he stares at you, but when you look at him he stares away. then go up to him and try to see if he's shy. =)

You should read guy magazines and stuff like that, they generally have tips on how guys should "attract" a woman... then you will know what to look out for.

But it seems that this guy likes you, cos these "indicators" all seem to point towards the fact that he is trying to get your attention and that he likes you- cos that's what my physics teacher told the guys in our class to do lol

You gotta take risks to get rewarded in life. Just ask him if he wants to grab a drink after work. If he says yes, that's a good sign too. Then, at the bar or whatever, he should say something that indicates whether or not he likes you. Set it up so the ball is in his court then see what he does with it.

Yeah, those are positive signs that he likes you. You should go to a happy hour, have a few drinks and see how he acts towards you when you're not in an office setting. If he singles you out a few times and seems to ignore the other people you're hanging with, it's a pretty safe bet that he likes you.

It sounds like he likes you, just don't waste this opportunity. Talk to him a lot and use flirty body language. Ask him out in a non-threatening way (so he doesn't feel like his masculinity is challenged); try asking him to 'meet up' instead of 'go on a date' and do an activity that's not traditionally a date.

You may also want to read this article:
Signs He Likes You, Signs He Doesn't

You should try flirting with him and if he flirts back he must like you!

Ask him in a casual way to grab lunch or a quick drink. Play it cool at first so that if he doesn't really like you, he's just being friendly, you won't be uncomfortable. If he says, "Nah, I can't today" and leaves it at that, he probably doesn't like you. If he's says, "Sure!" or "I can't today but how about tomorrow?" then he probably does like you.