Relationships and dating

I want to meet new people, form new connections, be affectionate, fall in love, etc. but why is the thought of it so overwhelming and overstimulating? Am I doing it to myself by overthinking or something? I feel it’s so easy for people to easily connect with others while it’s such a difficult thing for me to do. I get too overwhelmed when I start talking to someone new and they throw flirtatious comments my way, all my friends love this and are open to it but for some reason I just get overwhelmed and feel pressured. It throws me off. Maybe I haven’t met my person yet? Ive hung out with two guys before and I always come back home feeling extremely exhausted and tired so I ended it before it got too serious. I’m also an honest person so when they make jokes I don’t find funny I don’t laugh, it’s like I just can’t go with the flow almost. They also always point out my facial expressions, in my head I feel like im being very expressive but they always ask if im upset or annoyed lmao. I’ve been told multiple times already about how I have such a neutral serious face all the time so I try my best to be more expressive but i guess it’s not reflecting back to them. The only time I didn’t feel like this was with a guy who was very similar (we even shared the same mental disorders lmao) to me but he lowkey looked overwhelmed when pointing out to me how similar we are to each other. It didn’t work out and that’s fine. But I just struggle with the first meeting and it’s so annoying. I’m going on a date tomorrow and feel overwhelmed by the guy, he made a joke about how he’s going to love bomb me tomorrow and he even made me a gift. I just feel like I know nothing about affection and romance. I’ve never experienced celebrating Valentine’s Day and would really like to do that this year so that’s why I said yes to the date. I always always end up regretting saying no or ending it with people so im trying to put myself out there. Any advice on how to go one with meeting new people and dating in general? Am I overthinking this too much? My therapist said it’s not uncommon for people like me to feel like this when it comes to relationships and dating but do you guys have any personal advice? Any comments or suggestions on how you handle relationships?