Is this bad

Is it bad that I’m in love with my bf and want to spend my life with him but I’m only 18 and he’s my first bf and I’ve be only had sex with one other guy (once) so I kind of what to experience other guys before I spend my life with one person?

I think it sounds really bad but I mean ‘you only live once’ so is it that bad that I want to see what having sex with other guys is like or what being in relationships with other guys is like and how they would treat me?