Dating an Older Guy

I'm 20 years old & I've been dating a guy who is 28 years older than me for about 6 months now... I feel judged by my friends and family, they make me overthink my relationship knowing that I love this man so much. I am still in school, majoring in accounting but don't know what else I want in life (children, marriage, etc) I feel like he may be the one but this relationship is pretty complicated. He has a son, who is three years younger than I am and at times I don't understand how I feel about that. When I first started seeing him I never thought to think ahead, to ask him several questions because I looked past his age and I feel like maybe I shouldn't have. 
I love him but I need someone else's opinion, not my families opinion or my friends opinion because they have never been supportive of me ... They're extremely judgemental ..