<human>: This relationship is really my first real relationship.  We have been together for 3 years now and live together with our cats (2).  I feel like we have drifted into a best friend relationship rather than a partnership, when she tries to instigate sex, I am just not interested and can't bring myself to feel that way for her.  I have also been struggling with my sexuality a bit lately, and am coming to the conclusion that I may be bisexual.

The age difference between us has also worried me, I feel like she got to live a life where she got to travel and explore when she was younger, and if I get married to her now I won't have the opportunity to do that.  I also felt a bit pressured into proposing to her, she kept mentioning it to me in a guilty kinda way and I proposed to ease her feelings a bit.  She has been asking me if something is wrong lately and says she feels more distant, ive been telling her its fine, and am having trouble bringing myself to have a talk with her about my issues.

Im feeling more and more like I should break things off, but I have never broken up a serious relationship, especially where we live together (I own the place, so id be asking her to move out if we broke it off).  It is also so hard because she is definitely my best friend, and her family is so great.

We don't have any shared bank accounts but we do have some shared furniture.

Can you summarize the given text in a few sentences?
<bot>: Advice on breaking up with someone you live with? (also I guess I need to just man up and tell her my issues)