You have nothing to fear. The only way a cop can legally search your room is either by you giving them permission, or them having a search warrant.

Do not give them permission.

Second, trust me, a police officer hearing from a kid under 18 years of age saying his neighbor has pot stuff in his room, isn't going to bother with even asking a judge for a warrant. It's hear-say, andc the paperwork would be loads, and no cop or judge is going to bother searching a kids room because another kid said they had this and that.

For personal amounts, they won't bother.

You are paranoid.