Take a look at yourself from another's point of view. Consider what is positive and empower yourself with that. Think about what empowerment means to you. Could it mean being confident? Raising one's voice is not going to work but standing up for yourself will. When cut off tell them you insist on being heard. Try too to be the one initiating conversations. Check your non-verbal communication. Is it perhaps off putting? Are you able to tweak it to be less so. Something as simple as smiling and nodding can go far in being welcomed into the conversation. Showing interest in topics being spoken about ought to make you included too.