Just had first sexual actions with girlfriend, mastrabation

Hello,
I'm 14 and just experienced my first sexual like action with my girlfriend. After talking about it we decided we wanted to try oral sex... we did it and it felt amazing. However my problem is is that she felt guilty after doing it and wants to wait tell we do it again and honestly... I get turned on easy and often.. and normal masturbation isn't giving me the same pleasure it used to. So I guess I'm looking for advice on increasing pleasure while doing things myself... and before this It felt great btw...
Thanks