I really need advice ;-(

Me and my boyfriend are dating for like six months .He been such a nice guy and treating me well and he has a family plan with me .But for me I don’t feel the same way with him .I don’t have any physical attraction with him and I don’t even feel excited to meet him .But having him beside me right now is good for me because I am alone in the city away from home .At the same time I feel every selfish that I am doing such things to a person .I have to deal with that guilt everyday and I really don’t know what to do .