I think I married the wrong person for me

We were young lovers in high-school, for a kid he was a great boyfriend, he was a good fiancé, and now he is just an ok husband. He is a gamer who constantly I mean 24/7 plays on the computer. I try daily to think of things we have in common and I can’t think of anything anymore. He never leaves the house. He is never happy with anything we do together, sadly I’m pregnant with our second baby and I’m really considering leaving. I don’t know how to leave and I don’t know how to support two kids alone..... I’m scared to be alone with two kids. But I see all these ladies that have men who give them gifts, who spend time with them, who enjoy their company... it makes me so sad. I can’t remember the last time he got me a gift or spent anytime with me and actually enjoyed it. Truth is I probably will never be able to leave him and I’m so sad I’ve missed out on some of the young fun years of my life because I’m with this person.

Any advice?