Why am i miserable? is there any1 out there with solutions? i desperately nid help!?

im 19 and feel like an alien in this world already. i cant understand why i always like to be alone, why people judge me, and why everyone is just mean to me. i cry alot bcoz of my loneliness and false accusations. it seems like my dad thinks i lie n steal from him. and the rest of my family just brings me down so i always prefer not to be with them. i have no friends and im scared of talking to people bcoz im scared they'll find out that i might be gay. i feel like a loser most of the tym, even when i walk past people - it luks lyk they'll be making fun of me. i feel like im a failure n im going nower...the only place i kinda feel happy at is church, but my dad hates it...anyone out ther who could help me?