Coming on to strong?

Ive done this twice now. Its not on purpose. Whenever someone who I think is cute talks to me sometimes I say things that can be taken sexually and i dont mean for it to, i just choose the wrong words.

Example: a coworker was talking to me about my new job my first day and I was like "yeah this place is HUGE" but i said it weird and it IMMIDEATELY made things awkward and my face went red. So ever since then that guy doesnt even say hey anymore.

Is it just me or is it weird?

I say things that i dont mean to sound sexual but they end up coming out that way before i can catch it. I might be coming off as a creep? Or inexperinced. How do I stop this?