don't know how I feel

So I started talking to this guy and we met up for the first time the other day. I like him but I've got this thing where I start to overthinking things and I start to convince myself I don't like him. I had the same thing with my ex and every guy I ever liked. What should I do should I start a relationship with him, take it slow and tell him I have issues or just not go for it and stop talking to him in that way?