@Uniquepisces,
ok. you're an adult.
do NOT talk to co-workers about this.
do NOT. talking about crushes is barely tolerable with teenagers. it's a no go with co-workers.
If you are interested in this guy, say hi to him when you see him. really. start with something nice and basic.
if he's interested, he'll make it easier for you to say hi to him - he will also find a way to say hi to you.
keep co-workers and friends out of this.
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in general, work on saying hi/hello to more people every day. say hi to everyone you see (work your way up to this). conversation becomes easier once you've become comfortable with simple greetings.
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don't start with talking about his hair. that would be kind of weird.
talk about weather. talk about traffic on the way to work. small talk - work on small talk. don't start with personal stuff (like his hair)