I feel like I can't trust anyone because I'm a minor.
Don't be hard on yourself. Why would you feel like you can't trust people?
Because I'm not old enough for this crap.
You should do your best to trust people if possible, however if you have people around you that are not worthy of trusting then you are correct to not trust them. If you feel like you need some help since your parents and guardians are untrustworthy, then do not be afraid to reach out.
I'm sorry I just want to be with someone who I can trust even if I can take care of myself.
I honestly think you are quite mature by being selective about whom you can trust. That tells me you are formulating a logical reason to trust or not trust someone, and I think that is great. At the end of the day, it's better to have one friend you can fully trust than twenty friends that you don't trust.