really annoyed

Ok guys im starting get really annoyed withmy new pup diesel he has completely left lexys right ear completely bald and the whole side of her face full of cuts and scabs because when they play all he does is bite her and me and now lexy is starting to bite and its startin to really annoy me and he doesnt listen to me when i shout stop so ive to forcefully push him away then he snaps at me

What can i do

Can I ask exactly what you've tried so far? Very often, shouting at a pup will only further excite it, so it can actually just make them nip harder.

well when i feel hes being a little rough with her i say no in a decent tone then remove him from the room and ignore him then let him back in WHEN he stops yelping and crying.

i just feel like a complete noob or something and have a mental block toward training

My lexys face is really bad and dont feel safe to walk her as if the police stopped me they would automatically assume i was fighting her :'(

Try not to feel bad about it. Sometimes pups can be very tricky!

Do you have a crate for her? Crates are an excellent way of providing a place for a dog to feel safe and calm. When Dempsey was little, he was constantly biting, puppy-snarling and attacking anything that moved at his level. Five minutes in his crate would help him settle down. It's important to make sure that the dog is comfortable with the crate first though.

Also, what brand food do you feed her? This can have a huge impact on behaviour.

Tilly and Tommy both give as good as each other and although little miss innocent pretends she is sooooo scared of Tommy in the house he is the one carrying all of the battle scars though not as bad as how yours sounds
When you say Lexi is starting to bite , do you mean Diesels or people ?? How is she with the play ??

Have a look at this  

http://staffy-bull-terrier.com/stop_your_staffy_puppy_biting

like she started to attempt to bite me no eleanor i havnt got a crate for him YET. as they are both house dogs atm but will be moved outsode in the next 3 weeks.

i feed them both wainwrights.

lexy goes along with the play but it does get a little bit out of hand like wen i have a treat id give lexy a bigger half of it due to diesel just being a pup he would eat his then chase levy down and bite and get nasty with her to get her piece.