clutch?

03 mustang gt. when i start to drive i feel vibrations cant remember at the time if i can feel it in the pedall, but also if i put it in 5th gear and going slower than i should i feel a lot of vibrations want some input i feel as if its the clutch slipping its happened every now and then but i has been doing it really bad now let me know.
 
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Sounds like two different issues.

The first sounds a bit like clutch "chatter" and occurs when the clutch is taking up (i.e. you're still releasing the pedal) from a stop. It can happen if the clutch has been overheated and the disc faces are glazed, if the flywheel or pressure plate has heat checks, if the lining gets contaminated with oil etc. Sometimes chatter can occur on aftermarket "racing clutches", especially puck type discs, discs without sprung hubs or without marcel springs etc. Depending on the cause, sometimes the condition goes away on its own if the clutch is not abused for a while (e.g. faces are glazed) or if its a racing clutch, you'll have to get used to it.

The second sounds like typical "lugging" behavior. You say you're in top gear "going slower than i should"; I suggest selecting a lower gear to alleviate driveability issues seen when lugging.
 
Try re-describing the issue:

Do you get a vibration only when you're on the gas?
Do you get a vibration when you're at cruise and the gas is leveled off?
Do you get vibration when you're in gear and coasting?
Do you get vibration at speed with the car out of gear?
Is the vibration speed dependent or RPM dependent?
Do you feel the vibration is the shifter or clutch pedal?

How many miles on the clutch?
 
vibration when im on the gas. when i start of in first gear the car will bog out and ill have to sometimes give it more gas and the more gas i give it the worse it shakes only sometimes though. not sure how many miles on clutch. it did it sometimes when i first got the car only in 5th gear and very slightly but now its bad. not sure if shaking is in the handle or clutch.