Yes, it was a great experience. Up to that point, all I had done was masturbate. That guy KNEW I needed an epic blow job. I squirted in his mouth for seven consecutive thrusts. Within a week, I had my first experience with a woman. All I had needed was to get over my inhibitions.
I'd start with talking. We could talk about your anxiety, but other than validating your feelings, I wouldn't want to dwell on it. Rather, tell me what you like, what you want, and how you want it? What would a satisfying encounter look like to you; one you're likely to repeat? What are some things we can do to help you relax? I'd suggest that what you sound like you're looking for is purely recreational sex; it doesn't have to have any deeper meaning than that. It doesn't mean we're dating or you're Bi or Gay, just human. Humans are inherently sexual beings and crave sexual expression; sexual abstinence is an unnatural state for us. There's no shame in being human...and I can provide the release you're looking for without shaming, judgement, or condemnation. Rather than focus on the fact that you're "getting sex from a guy", focus your attention on the physical sensations; how good your cock feels to be in the warmth of someone's mouth again; their tongue swirling around the rim of your head, the sensation of someone caressing your naked thigh; pinching your nipples. You came to me for a blow job, so focus on what you came for, not my gender; that's irrelevant. Really indulge yourself; luxuriate in the sensations. I'm very amenable to real-time verbal feedback; faster/slower, harder/softer. When you're ready, let go and cum in my mouth; really cum. Be as free and feral and expressive as possible; moan, groan, shake, thrust with your hips; just let go fully, not repressing anything. Once I've sucked you dry, don't just jump up, throw your clothes on, and run out the door; chill for a little while; rest, catch your breath, let your physiology readjust. Normalize being naked around a guy; being touched sexually. There; you got your blow job, and you're still a Straight cisgender male; your masculinity just as intact now as it was when you arrived. As with anything, it gets easier with repetition. I like massage. Besides being relaxing, it normalizes human touch. I think it makes the transition to overt sexuality easier. A lot of guys like watching porn while getting head. A moderate glass of your favorite adult beverage might loosen you up, but higher doses negatively affect male sexual response...and nobody likes a drunk. If the visuals of a guy sucking your cock are problematic, a dark room decreases visual stimulation and refocuses attention elsewhere, like the sensations of your cock. All I ask for is kindness. Verbal, emotional, or physical abuse are absolute deal-breakers!