I guess many people dont know one thing - Yoga is for FREE. No one should take money for yoga.
Only a Guru can teach yoga. Guru in sanskrite meanining - the one who will remove the darkness from a sadhaka or student. Guru can be only a illuminated sage or liberated one , but they are hard to find.
Yoga is for everyone, but not all people can follow this path. To follow this path u need to detach yourself from wordly things arround u and this is very hard maybe thats why some people go to buddhist monasteries.
U are vegetarian, this is very good, but is not enough to meditate. Meditation is upon God only. U must be pure in thoughts and body to be able to meditate. I guess u know about pranayama. Pranayama is not a breathing exercise, is much more than this. Prana is a cosmic energy within us, yama mean exercise. Pranayama is to cleanse your nervous system, so for this u need to keep celibacy, vegetarian diet and u must be able to stay in one asana at least one hour. Asana (or postures) and Pranayama are to bring the prana inside of you. If you dont have prana you will not be able to meditate. Our body is depleted of prana when we love our partners. So if we dont have prana, than thats whywe cant meditate.
Yama and Niyama are ethics steps - to speak true with any cost, dont hate, dont get anger, love all, help anyone u can without expecting something in return, dont harm no one including animals, be good, happy, dont be proud. dont have fear, dont judge others, dont think bad etc. Only afteryou succed with all these u can do asanas. Each asana have his own mantra, that mean when u stay in a yoga asana u must say that mantra or payer is same thing. All the steps from yoga are for meditation. After asana is pranayama then follow prathyahara,dharana, dhyana(meditation), samadhi.
Meditation doesnt mean to close ur eyes and empty ur mind of thoughts, that is mental relaxation. The best medicine for us is the name of God . Faith can do everything, so i believe from my heart prayer will be the easy way for you.
Well, sometime people can get out from their body, during at night , or like you. Some people can control, some dont. So if you are scared about this dont try again. We have the physical body and 3 others bodies also- causal, astral,subtle.
So tell me why you want in fact? Maybe i can help you.