I need to to know why my stem isn't turing like wood, does that mean its still not ready to harvest?
You need a 60-100x microscope, or a lupe in that range. Look at the trichomes on the buds. When they're mostly cloudy, it's time. If you like more of a head high, harvest when they're more clear. If you like a body stone, wait until they're cloudy with some turning amber. If you're not sure, you can harvest a top bud and let the rest of the plant continue. This will let you sample different maturities.
This won't make sense to you now. The best description I've seen is: wait till your buds look like buds (what you expect to see bagged). After you've seem some plants mature, you'll know what I mean. If you wait for them to turn mostly cloudy, the buds will look like something you could imagine seeing dried and bagged. You'll know how that compares to more juvenile buds. (But, when you're looking at juvenile buds, it's hard to imagine what I'm talking about.).
I think the tendency of new growers is to harvest too soon. It's hard to wait. Get a microscope and follow your trichs.