Ok so I am having trouble playing guitar and singing at the same time. Oddly enough I seem to do fine with harsh vocals during lead riffs, fast riffs, but on the slow chords I have trouble following.

Also the songs I am writing mix harsh stonery riffs with High on Fire like vocals, but like Mastodon have harmonic breaks with clean vocals. I am very scared to use my regular singing voice even though people tell me that my clean voice sounds good. But I can't exert the same power in it like my harsh vocals.

Any help would be appreciated please and thank you
practice. When i started out it was impossible for me to sing and stum chords but after a while i just got the hang of it took me a lot of practising