Relationship dilemma

I am so in love with my boyfriend. He is one of the best people I know. However he is a little older, and wants to settle down soon. I could see myself marrying him and having kids together but not at this moment. I want to establish my career, travel, and more. At first I was all in for the idea because I love him so much. As we are doing long distance, I’m realizing different goals I want to purse. This breaks my heart bc I want to be with but I don’t want to waste his time. He has already experienced life(degree, good job, relationships, etc) I want him to be with more that can offer more than me. I’m supposed to see him in 3 months for my birthday/our 1 year anniversary. I don’t know anymore....