I can't astral project no matter what I try.

I have been trying to astral project for a long while but I am getting nowhere. Ever since I was very little I've had a sense that there was something more than our physical reality and there were other realms out there. I have a very vivid imagination and I am daydreaming constantly. I can also visualize things very realistically. Ever since I found out online about peoples astral projection experiences I have wanted to try it. I have tried all sorts of different techniques with ropes and ladders, rotating, swings, listening to special soundtracks.... but nothing. I've also tried at night, in the morning, in the afternoon-all different times. I lie there for a while and try to relax and I feel tingling and annoying itches or like something is biting me but I ignore it and eventually it will pass and then I will go very numb and sometimes feel like a lot of pressure is building up in my head. I try to imagine leaving my body but I just can't. I feel myself pushing against myself if that makes any sense but I can't get out. I'll even sometimes hear imaginary voices telling me to let go but nothing happens. Then I'll either fall asleep eventually (if it is night or early morning) or I'll just give up and get on. I also have a guardian, like a spirit who guides me and gives me advice and has been with me since I was 12. One thing he often tells me is that I am not completely of this world. I literally feel like I'm stuck here constantly wanting to see beyond this. If anyone can help me with any advice or could perhaps teach me how to astral project I would be very grateful if you could reply to this post. Thank you.