Sex help for a 22 year old

I've only had sex with one guy in my life and it was not pleasurable most of the time. I lost my virginity to him and I still have no idea what it feels like to finish. I loved it when he was inside me thrusting slowly but he hated not being in doggy style going at it hard. We broke up for other reasons besides sex and now I'm talking to this new guy. I don't know how to pleasure myself at all. I get turned on very quickly but I don't know what to do after that. I don't know if I should tell this guy that I don't know what feels good or I don't know how to pleasure myself.

Does anyone have any advice for me? How do I learn how to pleasure myself? And how do I have better sex?