Opinions - Need some questions answered

[0ctavarium]

Alright, so SWIM has gotten a nice gram of 5x.
We are set to try out a few hits friday night. However I have a few problems.

1. My grandpa was schizophrenic and commited suicide.
I have been reading about the whole family history of schizophrenia warning for almost all psychedelics. Is it safe for me to do it? This is the only psychosis incident in my whole family, as far as I know, but I'm 19 so I still have a chance. Also, is it safe for me to try other psychedelics, like LSD and MDMA?

2. Will other people ruin my personal insight experience?
There will be 4 other people there who will only smoke marijuana.

3. I am not experienced. I have only smoked marijuana (a lot of times though), and am not sure where to start my psychedelic adventures. I have been fascinated by them since I was 14, but didn't want to venture that deep in high school. Now I do.