Should I start a relationship with this girl?

I hope I'm posting in the correct area of this forum, should that not be the case, I apologize.

I've never had an official relationship except for one of those first grade romances, haha. I have fooled around with guys but I don't think it's for me.

The girl in question is one I've known for a while now, we're good acquaintances. I'm pretty sure she's gay even though she's never pointed it out explicitly. I'm also pretty sure she's interested in me, which again, she's never expressed directly, but I'm relatively confident about it as I usually read people correctly.

Therefore, I feel that were I to initiate something, she would respond positively; no problem there.

The truth is, though, that I don't actually like this girl the way I feel she likes me. The sole two things that make her attractive to me are the fact that she is probably gay and the fact that she seems strongly interested in me, which I admit is good for my ego. However, I've never had a relationship with a girl before and that makes the possibility even more attractive, even though I feel that I would be likely to hurt her because I would pretty much be using her genuine affection to see what it feels like.

I am, however, one of those people that has a tendency to take a liking to people after becoming involved with them, be it a friendship or more, so there is a chance that the result would be genuine affection on both parts.

I realize that this is all based on speculation; feel free to do or do not treat it as such.

Should I start a relationship with this girl?

I would definitely like to be more than acquaintances as I like her personality, but I have to decide whether I want to initiate a relationship or friendship, as they require different approaches in my opinion.