Everyone has that problem, even the seasoned veterans at times , myself included.
Many DMT users never get there , they stay in the periphery of DMT , the in-between world , and never get to see the main event .
Like I tell myself, stop being a pussy and get on with it !! , The fear is only an illusion, it can't hurt you
Good trip or bad , your be back perfectly fine either way .
I deep breath for 15 min in silence, it definitely helps , and this is important, when you take second hit ,
don't linger, don't hang around , exhale and quickly get on with the next , without getting sidetracked or caught in the moment .
And remember as long as your in a safe environment , your ok .
And if it does get a bit heavy , just concentrate on your breathing.
And one more thing , in my experience 95% of breakthroughs end in the most incredible experience of love.