first time trekking, dayar bagyal trek

it will be my first time trekking, so i have a few doubts: 1) i will be going with a stranger group, no friends. is it a good decision? 2) i tend to get sickness in hilly areas, what if i cause trouble to others in my group? 3) the package is of 7000rs, but i will hv to spend on exclusions: trekking essentials+meals in transit which leads me to a total of 10000rs approx. is it a decent budget or am i overspending?