Relationship advice

So the guy I am now seeing is 23, and I’m 18. I know that is fairly large distance, but he treats me very well. I’ve only been in two other relationships and they were both crap. I got cheated on. Some of my family got to meet him on New Years eve and it went very well, but they weren’t to happy about the age gap. But the way my sister talked to me about it, is if he treats me good, and if everything seems good then it’s okay. I just need advice about this and in how to deal with different type of stress when it comes to the age gap.