be funny, nice or well read
make them laugh
make them feel nice
or enjoy a good conversation on topics with them
human interaction is like playing ping pong (ideally)
it is easier if there are lot of people around so you don't have to carry the burden of pitching back during conversations alone and anyone in the group can bat back to keep the conversation going
if you only observe a conversation and never pitch anything in then you will usually go unnoticed and i think that's what you're referring to when you say you're uninteresting
it's fine to be like that if everyone tried to have something to say all the time it would devolve into a shouting match or people just itching to toss their 2 cents into the pile
i am pretty boring myself except for few very niche topics that i then get fired up over but that's pretty normal id assume, if you don't know much about the topic having a ok sense of humor can help to crack a joke every now and then to lighten the mood but don't be obnoxious