married but feeling so alone

i met my hubby when i was 20 and weve been together since then. we got married a year ago, but lately things arent great between us. he works long hours and comes home exhausted all the time. i feel like we dont have any real connection anymore. i try to initiate sex but hes always too tired or distracted by work stuff. its really lonely being in this marriage with no one to turn to for intimacy or affection. i miss that spark and passion from when we first started out. im not sure what the future holds, but right now i feel so isolated even though were supposed to be partners.