I'm looking for something that will help me correct my voice problem.
Firstly I speak too quietly, so it makes it difficult for people to hear me.
And second I tend to speak too fast and skip sylibols in words, as a result the words come up incomplete, then when I try to slow down in feels unatural.
Is there any training I can do to change my voice deeper in tonality, higher in sound and improve my pronounciation of the words???

Speak from your diaphragm. Practice pronunciation. You know your weaknesses so make it a conscious effort to speak correctly every time you talk to someone. Eventually, it will become automatic.

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"To Give anything less than your best is to sacrifice the gift" -Prefontaine

Not a PUA just a girl offering my opinions/advice

the speech thing sounds like it could be a medical issue...do you have any kind of social anxiety disorder? just curious...you wouldn`t happen to be left handed? i ask because a lot of left handed people have speech issues...so if you are, that could be part of the problem.

Why are you coming here for help?

Shouldn't you be seeing a specialist or at least a friend who can actually hear your voice and correct it with you?

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Man the first thing you should do is to search for exersices on the internet. Practice reading books loud, and in the voice tonality and volume you consider necesary enough. I used to do one in wich you have to bite a pencil while you read something loud, that improves your pronunciation.
Keep in mind that if you have a big problem you will need a big effort, don't give up easily. And the last thing I wanna tell you is that if you can't fix the problem with uncomplete words you should see a doctor, for sure it has some kind of SPAM, but the first thing you need is your willingness to change. Luck mate