Hi Tony, and welcome to JUB.
I started out in exactly your situation, so I can tell you about my experiences, and maybe this will help you understand where you're at.
First of all, I want to say up-front: there will be the inevitable troll who will reply "ya must be gay, lol" or some variant of that. By definition, you're straight if you're solely attracted to women. You're gay if you're solely attracted to men (i.e. the thought of pussy disgusts you - yuck, how could you go there? Is that you? No? I didn't think so). Poking something in your ass has nothing to do with attraction to men or women. For many of us, there's a curiosity about what it would feel like, and you went ahead and found out. Good for you! Now, what does this mean, you ask?
There are many straight men who enjoy anal stimulation, simply for the feeling, and would not entertain the thought of having sex with a man. Many enjoy anal penetration from their wife or partner. I have. A Google search such as "do straight men enjoy anal stimulation" will point you to those sorts of discussions.
You ask the questions "Now what?" (in the title) and "do I just keep going down this road?". Down what road? There's no harm in continuing to enjoy your
dildo You haven't suddenly switched sides just because you enjoyed sticking a
dildo in your ass. Whether you go down some other road, such as taking a real penis up your ass, is entirely up to you. It's not an automatic, inevitable progression. Let me ask you to imagine something: you're bent over, on all fours, ass in the air and a man is behind you with a hard cock and is about to fuck you. Are you excited for what will happen next? Only you can answer that (and you don't have to do so here). Enjoying a
dildo does not mean you're on a journey of no return to the point of being fucked by a man.
I hope that helps you to think things through.
Next, since you asked to hear from guys with similar experiences, I long considered myself straight. At an early age I discovered that poking small things in my ass felt nice, starting with a finger in the shower, various household items (yeah living in a small town, pre-internet and pre-online shopping was hard). When I moved to a city I bought a
dildo I got to the stage you're at - I thought "wow, that feels nice" but still thought "sex with a man? Yuck. I like women". Many years layer (in my 30s) curiosity got the better of me and I experienced the real thing, I had sex with a man. It went on for several men for a time, and I have to say it felt great. I was never attracted to men, in the way I am to women though. I don't eye off men in public like I look at women. At an older age now, I'm glad I had the experience of being fucked. I consider myself bisexual but straight-leaning, kind of "cocksexual", if you like - I'm not attracted to men as such, just cocks.
You might go down that route, you might not. You don't have to, and it's not inevitable. When you say "Now what?" and "Do I keep going?" - sure, why not keep enjoying a
dildo if it feels good. Whether you go further at some stage in your life is entirely up to you. Good luck and keep enjoying those feelings.