Summarize:

You don't always get what you want so don't be stubborn if your parents tell you something that you do not want to hear. If you have made your point respectfully and listen to what they say, they will be more receptive to what you have to say in the next conversation. Sometimes our parents might be dealing with their own set of problems. If one of your parents suffers from addiction or mental health issues, talk to other adults that you trust. Whether it's teachers, relatives, or counselors, there are many resources out there for you to talk to. Before speaking to anyone that you haven't established a relationship with, put in your research and ask your peers to help you. If you choose not to talk to your parents, deal with your issues maturely. Don't avoid any issues especially if it has to do with your health or safety. If you wanted to speak to your parents about another person, talk to them directly and respectfully.
Pick your battles. Talk to other trusted adults. Act maturely.