So let me explain my situation. I used to be able to sing Rock/Hard Rock songs and even sometimes used to growl. I've entered an pop course in uni as a vocalist, that course kind of "banned" constriction (what it mainly used in these types of singing) because it's on the long run unhealthy. I've tried again singing as I used to for my band and When I do it, especially on words that starts on vowels it just sounds wrong and awful. If i had to describe my voice it would be an Alto, warm ,quite breathy and broken at time. I am wondering if it's only the lack of practice (I am done some for a few months and it's just not coming out as before or right at all) or if it's me that learnt "the wrong way" in the first place. Anyways, if anyone has tips for this or techniques I would be forever grateful. Hope i was clear enough, sorry I am not quite understandable. Hope you all have a nice day/evening!
If you have been following rock music for a while, you have inevitably witnessed the trend where a relatively obscure band will put out a hit rock song and go from nobodies to famous people in a short while. They go from playing relatively few shows to suddenly being on tour for the majority of the year. It is shortly after than a few bands dreams will come to a screeching halt when the lead singer loses his voice and announces that he has done serious damage to his voice. It's such an issue now that some labels will immediately provide singers with a vocal coach that teaches them how to sing "properly" in such a way that protects their voice for the long haul. It can be done.
The thing that you are looking for as an answer to your question is a private voice teacher or voice regimen that you can pursue outside of your academic studies. You school's vocal teachers will likely not want to encourage your style in favor of a more broadly accepted style of singing.
I wish I could remember the name of the most used vocal coach for rock singers, but I believe this lady may have some information that could be useful to you: https://www.melissacross.com
This is not a proper answer as I don't have any experience in "rough" singing, but perhaps I can give some useful ideas and I was not able to condense them into a comment, so here goes.
I agree with Stinkfoot that practise (as in many things in life) is surely the way, but such practice must of course be guided by a strategy. I believe your main difficulty (much like in the case of this question stating the reverse difficulty) has much to do with conditioning: you have taught your body to work in a certain way when you sing and when you enter into "sing mode" your body takes control and does it "its" way.
Perhaps catching your body "by surprise" will help. What I mean is, work gradually as Stinkfoot suggests, but look for some strategies so that you don't instinctively and uncontrollably assume the singing mode your body is now used to.
Since I don't know the technique of "rough" singing I cannot give very specific advice, but some possible suggestions are:
Practice not singing: isolated syllables, or even speaking or reciting a poem (if that makes sense for the specific technique).
Try new and very simple songs, that do not require great effort. That way you don't need to concentrate on singing in tune, or expression, and can concentrate on the required body behaviour.
In "normal" (sorry for the singing technique chauvinism :-) singing we strive to relax the larynx and make all sorts of exercises to stretch the limits (high/low pitch, volume, expression, continuous note duration) while making a focused effort to maintain the larynx relaxed and low in the throat. What would be the parallel "focus point" in the specific technique you're trying to achieve? Try to devise some exercises that help you train that "focus point" while the other singing component don't get too much in the way. Look for tutorials and tips for newbies in "rough" singing that may give you some ideas to devise your own drills.
I hope this helps, but would be very much interested in more knowledgeable answers and feedback from your future experience.