Same old problem

[stinkyattic]

I'm sure you have seen this question a few times.
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lol sure have; it's all good. It's an easy fix.

I can't tell if I am over feeding or if it is to hot. I don't have the greatest ventalation, .

Not overfeeding. And if it were heat you would be seeing other symptoms too.

and I don't know if I am using the right food (I am using, Miracle-Gro Tomato plant food, it has 18-18-21, it's the closest I could find to 20-20-20) .

That's not the greatest. You need a much higher N in veg than the others.... see, tomato food is meant for a plant that is setting fruit AND growing, while ganj in veg stage is simply growing. A typical MJ veg fert would be more like 15-5-5 or about that... it's really variable, but always N is much higher.
I'll tell you how to fix that in a min.

I water once and a while, I wouldn't say its over watering cause I only water the leaves most of the time. I switch between a spray bottle with the tomato food and one with only water in it. .

Okay here's your prob. Only watering the leaves... ??? why EVER would you do it that way? Ya gots to water the DIRT. That's where the roots are. Yes, foliar feeding is cool and all, but that's in addition to a traditional feeding routine.
So the other thing you said about a spray bottle with only water, that's called REVERSE foliar feeding and it actually LEACHES nutrients OUT of the leaves, especially highly mobile ones like N.

I cut off the yellow leaves, should I of left them on?
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Six of one and half a dozen of the other... they may have greened up again, but then again, you don't want dead leaves in your grow space.

Anyway now we are going to fix your problem:

Your fertilizer:
If you are set on the stuff you've got, you need to add an additional source of Nitrogen. I know they sell Alaska Fish Fertilizer at walmart these days. Go get a bottle of it. Now mix your tomato food half strength, and then add what the fish bottle says on it. Now you have a more balanced fert for pot.

Your feeding method:
Lay off the foliar feed for now. You're in a deficiency already so you can just keep feeding and watching closely until you see a bit of greenup or at least the yellow stops getting worse, or the other thing you are likely to notice is a burst of new growth from the fresh N.

Can you get decent results with tomato food? Yes. (I prefer lawn food for cheap-ass emergency shit -I -ran -out- of -fertilizer, because it is designed for leafy greenness, not fruits) Do you have to tweak it a lot to get it right? Yup! Is it the best fert? Definitely not, but I'm sure that as you learn you will see why a 'real' pot fert is so great.