Should I even give them a chance?

OK, first off: I was adopted sejak my grandmother at about 5 years old, mostly cuz my actual parents couldn't take care of me, for reasons due to their poor choices in life.

I grew up KNOWING my parents were my birth parents, they're not dead atau anything. I grew up living not too far from them--If I wanted to, I could see them anytime I felt like doing so. Which I do, on a weekly basis atau so.

And last week, they took me and my nephew to this really fun place (laser tag, skating, arcade games and whatever) and it felt really great that I got a chance to bond with them.

Now, here's my problem: Should I even give my parents a chance? The last time I remember being with my birthfather was 8 years, playing in a lake. My birthmother is actually someone I tend to be around more, mostly due to how awkward it usually feels around my birthfather. (Reason for that: I'm Christian and he's an Atheist, and we NEVER bring up the subject beliefs. Ever.)

I know, no one is perfect, but should I even bother trying to bond with them? I mean, what if they're just messing with me? What if that time we spent together last week was just a set up to get me to trust them? I really hate to sound so paranoid, but what if they (well, mostly my "dad") really don't care about me at all?

Don't get me wrong, I'd Cinta to be able to bond with them, cuz that would be a new change in my life. It's just that I often hesitate at times. I have even shown my birthfather some of m interests and he says my drawings are really good. However, outta my 25 years of life, I have never been able to call them "Mom" and "Dad" to their faces.

Advice?