Not to sound like an after school special, but if a "friend" encourages you to do something harmful then they're not your friend. (Making fun of others, physically fighting, consuming more substances than you're comfortable with, generally breaking the law) But especially when people are younger they might be eager to have a friend, and feel pressured to go along with what another person suggests.
Depends. If you and the whole group are into fighting, abusing substances, and breaking the law, then you can definitely have real friends that encourage you to do those things.
A friend gives us validation, which could push us to do things we don't want in some situations.
We can also be betrayed by a friend, and our outlook on life/perspectives shift into darker territory, particularly if you are isolated and stuff...
Someone you consider to be a friend may also not have your best interests at heart, or may have a completely wrong impression of you, and may not protect you from danger when you need it most.
Despite those, IMO friends are kind of essential from a mental health perspective - we're social beings, isolation can bring out the worst in us. Whenever you come across someone that shares your values, keep them close 👍
Uhh, you shouldn't use "we" and try to be a voice of the majority of the "adults" group.
I don't know your situation, but the majority is out there, outside your apartments, socializing.