Secret bf, help?

So I'm 18 and have been dating my bf (35) for about 6 months now. I've been keeping him a secret because I'm nervous how my parents will react. Over time I've been falling harder and harder for him and really want my parents to meet him and for us to be able to go on normal dates where we don't need to sneak around or have a friend tag along as my excuse. I'm going to college in a couple months so it'll be easier to see him more since I won't be living with my parents anymore but i still really wanna tell my parents, I'm just scared what will happen after and how I should tell them. Any advice??