How old is to young

So my boyfriend wants me to have sex with him he is an ok guy but he hit me a few times I guess it what I deserve my dad hits me all the time I don’t want to have sex but if he want to I might I’m 13 he like 16 I just want to make him happy he don’t want to use protection does sex hurt and is he abusing me I know I might sound dumb but my dad told me when I was really young when he hit me and touched me it was and still because he loves me