>>33321241
I'm older than you, and have had similar frustrations through my life. It will keep happening; you will still get people talking over you about unrelated topics while you're saying something, barely registering what you're telling them, or cutting you out of social events not out of maliciousness but simply because they forgot you exist.

There's a lot of possible causes for this (a "drone", mumbly way of talking; talking too much; low self-esteem tending to make you unintentionally back down/over-agreeable in conversations), but I wouldn't worry too much about the specifics. Some of us just inherently tend to fade into the background, and fretting too much over exactly why tends to result in pointless wallowing and low self-esteem vicious cycles.

What worked for me was taking people aside and talking one-on-one in person, or with a group of no more than three people. People interact very differently in groups than they do on their own, and you might be someone who is better at handling people one at a time than within a group. Turn to someone who doesn't look very engaged and start talking about something else while a group conversation is going, if in a social context.