First and foremost, thanks for reaching out to this community. You will find that it is the only LS community devoted to objective, non-judgmental conversation. about the LS.
Jitters are normal. They are even more normal among introverts who are often uncomfortable even in vanilla social settings. When "my partner is dragging me into a social situation" is "amped" up to "my partner is dragging me into a potentially sexual situation", palms become sweaty, stomachs start to churn and so on.
By all means, follow the advice above and have a preset exit strategy: that will give you confidence of a sort. You should not hesitate to use that strategy.
However--and this may be difficult to wrap your head around--you might find that LS people are much easier to interact with.
Many/most introverts/shy people feel uncomfortable around others because of childhood experiences. They were bullied, verbally or physically abused, ridiculed, excluded from cliques, whatever. Those experiences made it easier to retreat, and difficult to trust. Their marriage is a protected space, and they rely on their partner to 'run interference'--even at innocuous gatherings such as cocktail parties (and we have seen the behavior at PTA meetings as well).
The interesting thing about LS people is that every one of us--and every one of our partners--has had to deal with the idea--and the reality --of vulnerability. Every one of us knows what it is like to be 'out there', thinking 'I might not be at all attracted to...." or, worse, "I might not be at all attractive to...", and worst of all, "s/he might see me for who I really am". As a consequence, LS people are among the most caring and supportive people we know. They do not judge. They do not criticize, they respect the idea of "no thank you, I'm not up for that".
Intimate LS people refer to each other as "playmates". The emphasis in the compound word is on the fragment "play" over "mate". We invite you to go back in your memory to a time before you were wounded, when play--dressing up, imagining yourself as an ideal, splashing in a pool and having harmless fun left you feeling good about yourself and about the world, pleasantly fatigued, ready to rest, and looking forward to tomorrow. The LS is all about that--license for fantasy, intention for fun, even while setting some boundaries.
For many--even most---adults, having fun with other people is something that is idealized on a screen and rarely experienced in day-to-day life. Sometimes its lack of time. More often, it's the vulnerability issue. You might find--as so many have--that simply being around LS people makes it easier to cast aside the vulnerability and enjoy others' company.
It would be wrong to suggest that the LS is all "orgasms and roses". There are highs and lows, great dates and bad dates. It is nevertheless a journey with intent to share some pleasure and even find some joy in everyone around you smiling and laughing and playing.
Give yourself an exit strategy. But don't deny yourself an entrance strategy.
Let us know how it goes.