Worried

How do I tell my husband that I want to have an open relationship without him being angry and wanting to get a divorce. I got married young at 18 will be 21 in September when to college for 1 semester cause I couldn’t afford it. All I do now is work, don’t get me wrong I love my husband to death but I would like to experience some other things in and open relationship maybe just for a little while would be great. But I don’t know