First Night.

So, last night, when I first tried to astral project it went as follows. I got into a warm place, I lay down and first focused on my breathing, after I did this, i cleared my mind, and breathed more. after a little while, it felt as if the ceiling was expanding upwards, and after a few more minutes the sides of my room also expanded outwards. It wasn't long until I felt very small in comparison to the space I was in now, except it was in my mind. I then focused on the space right above me in my mind, and it was as if the space kept growing bigger and bigger, and I felt smaller and smaller, and eventually it began pulsing, and I could feel my heart rate increasing, and there was a sense of fear being instilled within me, and when I tried to will my astral self to leave my body, nothing happened, and when I opened my eyes, it was just me in my room. in the same place I was in before. Can someone please help me understand what I did wrong? or if I was even on the right path to begin with? Than you so much