Well, think about halloween. You can be a firefighter/cat/ninja/etc for a day. It's a costume. We're not only letting REAL sexy nurses be sexy nurses, we're not making it so only REAL clowns can be clowns. There's even nerd costumes, sports player costumes, etc.
It's a costume. A costume means masquerading as something you're not. That's the entire point. If you want to dress Lolita for a day, then do it. If instead, you want to dedicate your life or a few days a week to it, go for it!
If you're worried about being accepted, people will find something to judge no matter what you wear. If you're worried about the community shunning you?
Well they all had to start sometime, right? Being stuck up and elitist about they way they dress isn't going to help their group win friends and influence people to love and accept the lolita lifestyle in the mainstream.
Also, there are always two sides to any community: people who suck and people who are kind. Get involved with the kind ones.
Basically, don't let people tell you you don't belong. Nobody was born lolita, they all had to learn through practice. You are no different and they should expect nothing higher of you.
Cosplays in Progress:
Haruno Sakura (Shippuden)
Theodora (Oz the Great and Powerful)
C. Viper (Street Fighter)
Twilight Princess/BRAWL Zelda (Green BRAWL ver)
Tharja (Fire Emblem Awakening)