Just annoying

I have an issue with some females, I mean I have alot that like me and I don't mind, but it starts to get on my nerves that they see your not interested and they still pursue you.I mean.. I can't help but like the attention at first because they are making it obvious that they like you and they are not discrete at all!!! But it's not coo if someone told you hey I have a girlfriend, and you push yourself on them sexually. I don't like that I mean, it happens to me all the time. I can understand if I was looking for it then yeah ok. But I have a boss that liked me straight off when I was hired. She's probably in her mid 30's and she constantly flirts with me and always checking me out when I walk off. Don't get me wrong she's attractive for her age but I don't want any part of that you know. NONE! But she waits until I was alone and I was in the restroom about to call my girlfriend because I was getting ready to clock out. She came in made small talk, I seen where it was going so I tried to leave but she grabbed me and kissed me. I was like in shock and I panicked! I mean I didn't know what to say or do I just stood there. I didn't want to tell my girlfriend at first because I was scared that she wouldn't believe me I mean I told her ahead of time that I have a feeling that my boss likes me, but I was being stupid and ignored it because I thought hey I'm 18 she's 30 something with 3 kids and a girlfriend that probably swallows my age twice, but yeah that just showed how wrong I was. But my girl took it well when I told her, surprising she was pissed at Tammy that's my boss name by the way, because the woman should have known better from the start. Have anyone had this experince besides me?