If just kissing is what you want, he has to respect your boundaries so don't be afraid to say that to him. If he puts pressure on you for more then you should walk away and not look back.
Just so you know it is perfectly normal not to be able to orgasm with someone else. I can make myself orgasm cliterally (is that a word?) with no trouble but my husband finds it really difficult. I can probably count the number of cliteral orgasms I've had from oral sex on one hand. Vanginally he can make me orgasm really easily with both penetrative sex and fingers so it's no big deal (I just prefer penetration- everyone is different)
So when you are ready to move into sexual touching with a partner (and only when you are ready) don't worry about orgasm because it really is different for everyone.